This is groff, produced by makeinfo version 4.8 from ./groff.texinfo.

   This manual documents GNU `troff' version 1.19.2.

   Copyright (C) 1994-2000, 2001, 2002, 2003, 2004, 2005 Free Software
Foundation, Inc.

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.1 or any later version published by the Free Software
     Foundation; with no Invariant Sections, with the Front-Cover texts
     being `A GNU Manual," and with the Back-Cover Texts as in (a)
     below.  A copy of the license is included in the section entitled
     `GNU Free Documentation License."

     (a) The FSF's Back-Cover Text is: `You have freedom to copy and
     modify this GNU Manual, like GNU software.  Copies published by
     the Free Software Foundation raise funds for GNU development."

INFO-DIR-SECTION Typesetting
START-INFO-DIR-ENTRY
* Groff: (groff).               The GNU troff document formatting system.
END-INFO-DIR-ENTRY


File: groff,  Node: Concept Index,  Prev: Program and File Index,  Up: Top

Appendix K Concept Index
************************

�[index�]
* Menu:

* ", at end of sentence <1>:             Using Symbols.       (line 272)
* ", at end of sentence:                 Sentences.           (line  19)
* ", in a macro argument:                Request and Macro Arguments.
                                                              (line  26)
* %, as delimiter:                       Escapes.             (line  70)
* &, as delimiter:                       Escapes.             (line  70)
* ', as a comment:                       Comments.            (line  44)
* ', at end of sentence <1>:             Using Symbols.       (line 272)
* ', at end of sentence:                 Sentences.           (line  19)
* ', delimiting arguments:               Escapes.             (line  30)
* (, as delimiter:                       Escapes.             (line  70)
* (, starting a two-character identifier <1>: Escapes.        (line  16)
* (, starting a two-character identifier: Identifiers.        (line  75)
* ), as delimiter:                       Escapes.             (line  70)
* ), at end of sentence <1>:             Using Symbols.       (line 272)
* ), at end of sentence:                 Sentences.           (line  19)
* *, as delimiter:                       Escapes.             (line  70)
* *, at end of sentence <1>:             Using Symbols.       (line 272)
* *, at end of sentence:                 Sentences.           (line  19)
* +, and page motion:                    Expressions.         (line  47)
* +, as delimiter:                       Escapes.             (line  70)
* -, and page motion:                    Expressions.         (line  47)
* -, as delimiter:                       Escapes.             (line  70)
* ., as delimiter:                       Escapes.             (line  70)
* .h register, difference to nl:         Diversions.          (line  82)
* .ps register, in comparison with .psr: Fractional Type Sizes.
                                                              (line  43)
* .s register, in comparison with .sr:   Fractional Type Sizes.
                                                              (line  43)
* .S register, Plan 9 alias for .tabs:   Tabs and Fields.     (line 135)
* .t register, and diversions:           Diversion Traps.     (line   7)
* .tabs register, Plan 9 alias (.S):     Tabs and Fields.     (line 135)
* .V register, and vs:                   Changing Type Sizes. (line  93)
* /, as delimiter:                       Escapes.             (line  70)
* 8-bit input:                           Font File Format.    (line  51)
* <, as delimiter:                       Escapes.             (line  70)
* <colon>, as delimiter:                 Escapes.             (line  70)
* =, as delimiter:                       Escapes.             (line  70)
* >, as delimiter:                       Escapes.             (line  70)
* [, macro names starting with, and refer: Identifiers.       (line  48)
* [, starting an identifier <1>:         Escapes.             (line  20)
* [, starting an identifier:             Identifiers.         (line  77)
* \!, and output:                        Diversions.          (line 179)
* \!, and trnt:                          Character Translations.
                                                              (line 245)
* \!, in top-level diversion:            Diversions.          (line 171)
* \!, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \!, used as delimiter:                 Escapes.             (line  55)
* \$, when reading text for a macro:     Copy-in Mode.        (line   6)
* \%, and translations:                  Character Translations.
                                                              (line 170)
* \%, following \X or \Y:                Manipulating Hyphenation.
                                                              (line  99)
* \%, in \X:                             Postprocessor Access.
                                                              (line  13)
* \%, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \%, used as delimiter:                 Escapes.             (line  55)
* \&, and glyph definitions:             Using Symbols.       (line 284)
* \&, and translations:                  Character Translations.
                                                              (line 180)
* \&, at end of sentence:                Sentences.           (line  25)
* \&, escaping control characters:       Requests.            (line  49)
* \&, in \X:                             Postprocessor Access.
                                                              (line  13)
* \&, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \&, used as delimiter:                 Escapes.             (line  55)
* \', and translations:                  Character Translations.
                                                              (line 164)
* \', incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \', used as delimiter:                 Escapes.             (line  55)
* \(, and translations:                  Character Translations.
                                                              (line 164)
* \), in \X:                             Postprocessor Access.
                                                              (line  13)
* \), used as delimiter:                 Escapes.             (line  55)
* \*, and warnings:                      Warnings.            (line  54)
* \*, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  14)
* \*, when reading text for a macro:     Copy-in Mode.        (line   6)
* \, disabling (eo):                     Character Translations.
                                                              (line  22)
* \,, used as delimiter:                 Escapes.             (line  55)
* \-, and translations:                  Character Translations.
                                                              (line 164)
* \-, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \-, used as delimiter:                 Escapes.             (line  55)
* \/, used as delimiter:                 Escapes.             (line  55)
* \0, used as delimiter:                 Escapes.             (line  55)
* \<colon>, in \X:                       Postprocessor Access.
                                                              (line  13)
* \<colon>, used as delimiter:           Escapes.             (line  55)
* \<RET>, when reading text for a macro: Copy-in Mode.        (line   6)
* \<SP>, difference to \~:               Request and Macro Arguments.
                                                              (line  21)
* \<SP>, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \<SP>, used as delimiter:              Escapes.             (line  55)
* \?, in top-level diversion:            Diversions.          (line 176)
* \?, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line 107)
* \?, used as delimiter:                 Escapes.             (line  55)
* \@, used as delimiter:                 Escapes.             (line  55)
* \[, and translations:                  Character Translations.
                                                              (line 164)
* \\, when reading text for a macro:     Copy-in Mode.        (line   6)
* \^, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \^, used as delimiter:                 Escapes.             (line  55)
* \_, and translations:                  Character Translations.
                                                              (line 164)
* \_, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \_, used as delimiter:                 Escapes.             (line  55)
* \`, and translations:                  Character Translations.
                                                              (line 164)
* \`, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \`, used as delimiter:                 Escapes.             (line  55)
* \A, allowed delimiters:                Escapes.             (line  62)
* \a, and translations:                  Character Translations.
                                                              (line 173)
* \A, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \a, used as delimiter:                 Escapes.             (line  55)
* \B, allowed delimiters:                Escapes.             (line  62)
* \b, limitations:                       Drawing Requests.    (line 231)
* \b, possible quote characters:         Escapes.             (line  39)
* \C, allowed delimiters:                Escapes.             (line  62)
* \c, and fill mode:                     Line Control.        (line  74)
* \c, and no-fill mode:                  Line Control.        (line  64)
* \C, and translations:                  Character Translations.
                                                              (line 164)
* \c, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \c, used as delimiter:                 Escapes.             (line  55)
* \D'f ...' and horizontal resolution:   Drawing Requests.    (line 155)
* \D, allowed delimiters:                Escapes.             (line  65)
* \d, used as delimiter:                 Escapes.             (line  55)
* \e, and glyph definitions:             Using Symbols.       (line 284)
* \e, and translations:                  Character Translations.
                                                              (line 168)
* \e, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line 107)
* \e, used as delimiter:                 Escapes.             (line  74)
* \E, used as delimiter:                 Escapes.             (line  55)
* \e, used as delimiter:                 Escapes.             (line  55)
* \F, and changing fonts:                Changing Fonts.      (line  11)
* \F, and font positions:                Font Positions.      (line  61)
* \f, and font translations:             Changing Fonts.      (line  53)
* \f, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  55)
* \H, allowed delimiters:                Escapes.             (line  65)
* \h, allowed delimiters:                Escapes.             (line  65)
* \H, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  55)
* \H, using + and -:                     Expressions.         (line  57)
* \H, with fractional type sizes:        Fractional Type Sizes.
                                                              (line   6)
* \L, allowed delimiters:                Escapes.             (line  65)
* \l, allowed delimiters:                Escapes.             (line  65)
* \L, and glyph definitions:             Using Symbols.       (line 284)
* \l, and glyph definitions:             Using Symbols.       (line 284)
* \N, allowed delimiters:                Escapes.             (line  65)
* \N, and translations:                  Character Translations.
                                                              (line 164)
* \n, and warnings:                      Warnings.            (line  61)
* \n, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  14)
* \n, when reading text for a macro:     Copy-in Mode.        (line   6)
* \o, possible quote characters:         Escapes.             (line  39)
* \p, used as delimiter:                 Escapes.             (line  55)
* \R, after \c:                          Line Control.        (line  56)
* \R, allowed delimiters:                Escapes.             (line  65)
* \R, and warnings:                      Warnings.            (line  61)
* \R, difference to nr:                  Auto-increment.      (line  11)
* \r, used as delimiter:                 Escapes.             (line  55)
* \R, using + and -:                     Expressions.         (line  57)
* \S, allowed delimiters:                Escapes.             (line  65)
* \s, allowed delimiters:                Escapes.             (line  65)
* \S, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  55)
* \s, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  55)
* \s, using + and -:                     Expressions.         (line  57)
* \s, with fractional type sizes:        Fractional Type Sizes.
                                                              (line   6)
* \t, and translations:                  Character Translations.
                                                              (line 173)
* \t, and warnings:                      Warnings.            (line  68)
* \t, used as delimiter:                 Escapes.             (line  55)
* \u, used as delimiter:                 Escapes.             (line  55)
* \v, allowed delimiters:                Escapes.             (line  65)
* \v, internal representation:           Gtroff Internals.    (line  53)
* \w, allowed delimiters:                Escapes.             (line  62)
* \x, allowed delimiters:                Escapes.             (line  65)
* \X, and special characters:            Postprocessor Access.
                                                              (line  17)
* \X, followed by \%:                    Manipulating Hyphenation.
                                                              (line  99)
* \X, possible quote characters:         Escapes.             (line  39)
* \Y, followed by \%:                    Manipulating Hyphenation.
                                                              (line  99)
* \Z, allowed delimiters:                Escapes.             (line  62)
* \{, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \{, used as delimiter:                 Escapes.             (line  55)
* \|, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \|, used as delimiter:                 Escapes.             (line  55)
* \}, and warnings:                      Warnings.            (line  72)
* \}, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  69)
* \}, used as delimiter:                 Escapes.             (line  55)
* \~, and translations:                  Character Translations.
                                                              (line 170)
* \~, difference to \<SP>:               Request and Macro Arguments.
                                                              (line  21)
* \~, used as delimiter:                 Escapes.             (line  55)
* ], as part of an identifier:           Identifiers.         (line  42)
* ], at end of sentence <1>:             Using Symbols.       (line 272)
* ], at end of sentence:                 Sentences.           (line  19)
* ], ending an identifier <1>:           Escapes.             (line  20)
* ], ending an identifier:               Identifiers.         (line  77)
* ], macro names starting with, and refer: Identifiers.       (line  48)
* aborting (ab):                         Debugging.           (line  40)
* absolute position operator (|):        Expressions.         (line  52)
* accent marks [ms]:                     ms Strings and Special Characters.
                                                              (line   6)
* access of postprocessor:               Postprocessor Access.
                                                              (line   6)
* accessing unnamed glyphs with \N:      Font File Format.    (line  51)
* activating kerning (kern):             Ligatures and Kerning.
                                                              (line  42)
* activating ligatures (lg):             Ligatures and Kerning.
                                                              (line  24)
* activating track kerning (tkf):        Ligatures and Kerning.
                                                              (line  60)
* ad request, and hyphenation margin:    Manipulating Hyphenation.
                                                              (line 210)
* ad request, and hyphenation space:     Manipulating Hyphenation.
                                                              (line 225)
* adjusting:                             Filling and Adjusting.
                                                              (line   6)
* adjusting and filling, manipulating:   Manipulating Filling and Adjusting.
                                                              (line   6)
* adjustment mode register (.j):         Manipulating Filling and Adjusting.
                                                              (line  96)
* adobe glyph list (AGL):                Using Symbols.       (line  94)
* AGL (adobe glyph list):                Using Symbols.       (line  94)
* alias, diversion, creating (als):      Strings.             (line 224)
* alias, macro, creating (als):          Strings.             (line 224)
* alias, number register, creating (aln): Setting Registers.  (line  79)
* alias, string, creating (als):         Strings.             (line 224)
* als request, and \$0:                  Parameters.          (line  48)
* am, am1, ami requests, and warnings:   Warnings.            (line  54)
* annotations:                           Footnotes and Annotations.
                                                              (line   6)
* appending to a diversion (da):         Diversions.          (line  18)
* appending to a file (opena):           I/O.                 (line 199)
* appending to a macro (am):             Writing Macros.      (line 110)
* appending to a string (as):            Strings.             (line 171)
* arc, drawing (\D'a ...'):              Drawing Requests.    (line 132)
* argument delimiting characters:        Escapes.             (line  30)
* arguments to requests and macros:      Request and Macro Arguments.
                                                              (line   6)
* arguments, and compatibility mode:     Gtroff Internals.    (line  93)
* arguments, macro (\$):                 Parameters.          (line  21)
* arguments, of strings:                 Strings.             (line  15)
* arithmetic operators:                  Expressions.         (line   8)
* artificial fonts:                      Artificial Fonts.    (line   6)
* as, as1 requests, and comments:        Comments.            (line  16)
* as, as1 requests, and warnings:        Warnings.            (line  54)
* ASCII approximation output register (.A) <1>: Built-in Registers.
                                                              (line 103)
* ASCII approximation output register (.A): Groff Options.    (line 203)
* ASCII, output encoding:                Groff Options.       (line 142)
* asciify request, and writem:           I/O.                 (line 221)
* assigning formats (af):                Assigning Formats.   (line   6)
* assignments, indirect:                 Interpolating Registers.
                                                              (line  11)
* assignments, nested:                   Interpolating Registers.
                                                              (line  11)
* AT&T troff, ms macro package differences: Differences from AT&T ms.
                                                              (line   6)
* auto-increment:                        Auto-increment.      (line   6)
* available glyphs, list (`groff_char(7)' man page): Using Symbols.
                                                              (line  80)
* background color name register (.M):   Colors.              (line 100)
* backslash, printing (\\, \e, \E, \[rs]) <1>: Implementation Differences.
                                                              (line 107)
* backslash, printing (\\, \e, \E, \[rs]): Escapes.           (line  77)
* backspace character:                   Identifiers.         (line  12)
* backspace character, and translations: Character Translations.
                                                              (line 173)
* backtrace of input stack (backtrace):  Debugging.           (line  94)
* baseline:                              Sizes.               (line   6)
* basic unit (u):                        Measurements.        (line   6)
* basics of macros:                      Basics.              (line   6)
* bd request, and font styles:           Font Families.       (line  61)
* bd request, and font translations:     Changing Fonts.      (line  53)
* bd request, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  86)
* begin of conditional block (\{):       if-else.             (line  38)
* beginning diversion (di):              Diversions.          (line  18)
* blank line <1>:                        Requests.            (line  28)
* blank line:                            Implicit Line Breaks.
                                                              (line  10)
* blank line (sp):                       Basics.              (line  95)
* blank line macro (blm) <1>:            Blank Line Traps.    (line   7)
* blank line macro (blm) <2>:            Requests.            (line  28)
* blank line macro (blm):                Implicit Line Breaks.
                                                              (line  10)
* blank line traps:                      Blank Line Traps.    (line   6)
* blank lines, disabling:                Manipulating Spacing.
                                                              (line 115)
* block, conditional, begin (\{):        if-else.             (line  38)
* block, condititional, end (\}):        if-else.             (line  38)
* bold face [man]:                       Man font macros.     (line  14)
* bold face, imitating (bd):             Artificial Fonts.    (line  98)
* bottom margin:                         Page Layout.         (line  20)
* bounding box:                          Miscellaneous.       (line 145)
* box rule glyph (\[br]):                Drawing Requests.    (line  51)
* box, boxa requests, and warnings:      Warnings.            (line  54)
* boxa request, and dn (dl):             Diversions.          (line  87)
* bp request, and top-level diversion:   Page Control.        (line  25)
* bp request, and traps (.pe):           Page Location Traps. (line 139)
* bp request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* bp request, using + and -:             Expressions.         (line  57)
* br glyph, and cflags:                  Using Symbols.       (line 268)
* break <1>:                             Manipulating Filling and Adjusting.
                                                              (line   6)
* break:                                 Basics.              (line  51)
* break (br):                            Basics.              (line 122)
* break request, in a while loop:        while.               (line  73)
* break, implicit:                       Implicit Line Breaks.
                                                              (line   6)
* built-in registers:                    Built-in Registers.  (line   6)
* bulleted list, example markup [ms]:    Lists in ms.         (line  23)
* c unit:                                Measurements.        (line  27)
* calling convention of preprocessors:   Preprocessors in man pages.
                                                              (line   6)
* capabilities of groff:                 groff Capabilities.  (line   6)
* ce request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* ce request, difference to .ad c:       Manipulating Filling and Adjusting.
                                                              (line  68)
* centered text:                         Manipulating Filling and Adjusting.
                                                              (line  68)
* centering lines (ce) <1>:              Manipulating Filling and Adjusting.
                                                              (line 190)
* centering lines (ce):                  Basics.              (line 108)
* centimeter unit (c):                   Measurements.        (line  27)
* cf request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* changing font family (fam, \F):        Font Families.       (line  24)
* changing font position (\f):           Font Positions.      (line  61)
* changing font style (sty):             Font Families.       (line  61)
* changing fonts (ft, \f):               Changing Fonts.      (line  11)
* changing format, and read-only registers: Assigning Formats.
                                                              (line  69)
* changing the font height (\H):         Artificial Fonts.    (line  16)
* changing the font slant (\S):          Artificial Fonts.    (line  46)
* changing the page number character (pc): Page Layout.       (line  89)
* changing trap location (ch):           Page Location Traps. (line 106)
* changing type sizes (ps, \s):          Changing Type Sizes. (line  11)
* changing vertical line spacing (vs):   Changing Type Sizes. (line  87)
* char request, and soft hyphen character: Manipulating Hyphenation.
                                                              (line 240)
* char request, and translations:        Character Translations.
                                                              (line 164)
* char request, used with \N:            Using Symbols.       (line 207)
* character:                             Using Symbols.       (line   6)
* character properties (cflags):         Using Symbols.       (line 241)
* character translations:                Character Translations.
                                                              (line   6)
* character, backspace:                  Identifiers.         (line  12)
* character, backspace, and translations: Character Translations.
                                                              (line 173)
* character, control (.):                Requests.            (line   6)
* character, control, changing (cc):     Character Translations.
                                                              (line   6)
* character, defining (char):            Using Symbols.       (line 284)
* character, defining fallback (fchar, fschar, schar): Using Symbols.
                                                              (line 284)
* character, escape, changing (ec):      Character Translations.
                                                              (line  47)
* character, escape, while defining glyph: Using Symbols.     (line 284)
* character, field delimiting (fc):      Fields.              (line   6)
* character, field padding (fc):         Fields.              (line   6)
* character, hyphenation (\%):           Manipulating Hyphenation.
                                                              (line  85)
* character, leader repetition (lc):     Leaders.             (line  23)
* character, leader, and translations:   Character Translations.
                                                              (line 173)
* character, leader, non-interpreted (\a): Leaders.           (line  18)
* character, named (\C):                 Using Symbols.       (line 191)
* character, newline:                    Escapes.             (line  72)
* character, newline, and translations:  Character Translations.
                                                              (line 173)
* character, no-break control ('):       Requests.            (line   6)
* character, no-break control, changing (c2): Character Translations.
                                                              (line   6)
* character, soft hyphen, setting (shc): Manipulating Hyphenation.
                                                              (line 240)
* character, space:                      Escapes.             (line  72)
* character, special:                    Character Translations.
                                                              (line 164)
* character, tab:                        Escapes.             (line  72)
* character, tab repetition (tc):        Tabs and Fields.     (line 139)
* character, tab, and translations:      Character Translations.
                                                              (line 173)
* character, tab, non-interpreted (\t):  Tabs and Fields.     (line  10)
* character, tabulator:                  Tab Stops.           (line   6)
* character, transparent <1>:            Using Symbols.       (line 272)
* character, transparent:                Sentences.           (line  19)
* character, whitespace:                 Identifiers.         (line  10)
* character, zero width space (\&) <1>:  Drawing Requests.    (line  32)
* character, zero width space (\&) <2>:  Ligatures and Kerning.
                                                              (line  47)
* character, zero width space (\&):      Requests.            (line  49)
* characters, argument delimiting:       Escapes.             (line  30)
* characters, end-of-sentence:           Using Symbols.       (line 249)
* characters, hyphenation:               Using Symbols.       (line 253)
* characters, input, and output glyphs, compatibility with AT&T troff: Implementation Differences.
                                                              (line  86)
* characters, invalid for trf request:   I/O.                 (line  67)
* characters, invalid input:             Identifiers.         (line  15)
* characters, overlapping:               Using Symbols.       (line 262)
* characters, special:                   Special Characters.  (line   6)
* characters, unnamed, accessing with \N: Font File Format.   (line  51)
* circle, drawing (\D'c ...'):           Drawing Requests.    (line 113)
* circle, solid, drawing (\D'C ...'):    Drawing Requests.    (line 118)
* closing file (close):                  I/O.                 (line 230)
* code, hyphenation (hcode):             Manipulating Hyphenation.
                                                              (line 174)
* color name, background, register (.M): Colors.              (line 100)
* color name, drawing, register (.m):    Colors.              (line  70)
* color name, fill, register (.M):       Colors.              (line 100)
* color, default:                        Colors.              (line  25)
* colors:                                Colors.              (line   6)
* colors, fill, unnamed (\D'F...'):      Drawing Requests.    (line 206)
* command prefix:                        Environment.         (line  10)
* command-line options:                  Groff Options.       (line  50)
* commands, embedded:                    Embedded Commands.   (line   6)
* comments:                              Comments.            (line   6)
* comments in font files:                Font File Format.    (line  36)
* comments, lining up with tabs:         Comments.            (line  21)
* comments, with ds:                     Strings.             (line  42)
* common features:                       Common Features.     (line   6)
* common name space of macros, diversions, and strings: Strings.
                                                              (line  94)
* comparison operators:                  Expressions.         (line  15)
* compatibility mode <1>:                Implementation Differences.
                                                              (line   6)
* compatibility mode:                    Warnings.            (line  90)
* compatibility mode, and parameters:    Gtroff Internals.    (line  93)
* composite glyph names:                 Using Symbols.       (line  94)
* conditional block, begin (\{):         if-else.             (line  38)
* conditional block, end (\}):           if-else.             (line  38)
* conditional page break (ne):           Page Control.        (line  34)
* conditionals and loops:                Conditionals and Loops.
                                                              (line   6)
* consecutive hyphenated lines (hlm):    Manipulating Hyphenation.
                                                              (line  47)
* constant glyph space mode (cs):        Artificial Fonts.    (line 127)
* contents, table of <1>:                Leaders.             (line  30)
* contents, table of:                    Table of Contents.   (line   6)
* continuation, input line (\):          Line Control.        (line  39)
* continuation, output line (\c):        Line Control.        (line  39)
* continue request, in a while loop:     while.               (line  73)
* continuous underlining (cu):           Artificial Fonts.    (line  87)
* control character (.):                 Requests.            (line   6)
* control character, changing (cc):      Character Translations.
                                                              (line   6)
* control character, no-break ('):       Requests.            (line   6)
* control character, no-break, changing (c2): Character Translations.
                                                              (line   6)
* control, line:                         Line Control.        (line   6)
* control, page:                         Page Control.        (line   6)
* conventions for input:                 Input Conventions.   (line   6)
* copy-in mode:                          Copy-in Mode.        (line   6)
* copy-in mode, and macro arguments:     Parameters.          (line  21)
* copy-in mode, and write requests:      I/O.                 (line 211)
* copying environment (evc):             Environments.        (line  72)
* correction between italic and roman glyph (\/, \,): Ligatures and Kerning.
                                                              (line  80)
* correction, italic (\/):               Ligatures and Kerning.
                                                              (line  80)
* correction, left italic (\,):          Ligatures and Kerning.
                                                              (line  92)
* cover page macros, [ms]:               ms Cover Page Macros.
                                                              (line   6)
* cp request, and glyph definitions:     Using Symbols.       (line 284)
* cp1047, input encoding:                Input Encodings.     (line   9)
* cp1047, output encoding:               Groff Options.       (line 154)
* creating alias, for diversion (als):   Strings.             (line 224)
* creating alias, for macro (als):       Strings.             (line 224)
* creating alias, for number register (aln): Setting Registers.
                                                              (line  79)
* creating alias, for string (als):      Strings.             (line 224)
* creating new characters (char):        Using Symbols.       (line 284)
* credits:                               Credits.             (line   6)
* cs request, and font styles:           Font Families.       (line  61)
* cs request, and font translations:     Changing Fonts.      (line  53)
* cs request, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  86)
* cs request, with fractional type sizes: Fractional Type Sizes.
                                                              (line   6)
* current directory:                     Macro Directories.   (line  21)
* current input file name register (.F): Built-in Registers.  (line  12)
* current page number (%):               Page Control.        (line  28)
* current time:                          I/O.                 (line 171)
* current time, hours (hours):           Built-in Registers.  (line  35)
* current time, minutes (minutes):       Built-in Registers.  (line  31)
* current time, seconds (seconds):       Built-in Registers.  (line  26)
* current vertical position (nl):        Page Control.        (line  68)
* da request, and dn (dl):               Diversions.          (line  87)
* da request, and warnings:              Warnings.            (line  49)
* date, day of the month register (dy):  Built-in Registers.  (line  42)
* date, day of the week register (dw):   Built-in Registers.  (line  39)
* date, month of the year register (mo): Built-in Registers.  (line  45)
* date, year register (year, yr):        Built-in Registers.  (line  48)
* day of the month register (dy):        Built-in Registers.  (line  42)
* day of the week register (dw):         Built-in Registers.  (line  39)
* de request, and while:                 while.               (line  23)
* de, de1, dei requests, and warnings:   Warnings.            (line  54)
* debugging:                             Debugging.           (line   6)
* default color:                         Colors.              (line  25)
* default indentation [man]:             Miscellaneous man macros.
                                                              (line   6)
* default indentation, resetting [man]:  Man usage.           (line 127)
* default units:                         Default Units.       (line   6)
* defining character (char):             Using Symbols.       (line 284)
* defining fallback character (fchar, fschar, schar): Using Symbols.
                                                              (line 284)
* defining glyph (char):                 Using Symbols.       (line 284)
* defining symbol (char):                Using Symbols.       (line 284)
* delayed text:                          Footnotes and Annotations.
                                                              (line  10)
* delimited arguments, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  45)
* delimiting character, for fields (fc): Fields.              (line   6)
* delimiting characters for arguments:   Escapes.             (line  30)
* depth, of last glyph (.cdp):           Environments.        (line  97)
* DESC file, format:                     DESC File Format.    (line   6)
* device resolution:                     DESC File Format.    (line  11)
* devices for output <1>:                Output Devices.      (line   6)
* devices for output:                    Output device intro. (line   6)
* dg glyph, at end of sentence <1>:      Using Symbols.       (line 272)
* dg glyph, at end of sentence:          Sentences.           (line  19)
* di request, and warnings:              Warnings.            (line  49)
* differences in implementation:         Implementation Differences.
                                                              (line   6)
* digit width space (\0):                Page Motions.        (line 139)
* digits, and delimiters:                Escapes.             (line  68)
* dimensions, line:                      Line Layout.         (line   6)
* directories for fonts:                 Font Directories.    (line   6)
* directories for macros:                Macro Directories.   (line   6)
* directory, current:                    Macro Directories.   (line  21)
* directory, for tmac files:             Macro Directories.   (line  11)
* directory, home:                       Macro Directories.   (line  24)
* directory, platform-specific:          Macro Directories.   (line  26)
* directory, site-specific <1>:          Font Directories.    (line  29)
* directory, site-specific:              Macro Directories.   (line  26)
* disabling \ (eo):                      Character Translations.
                                                              (line  22)
* disabling hyphenation (\%):            Manipulating Hyphenation.
                                                              (line  85)
* discardable horizontal space:          Manipulating Filling and Adjusting.
                                                              (line 167)
* discarded space in traps:              Manipulating Spacing.
                                                              (line  39)
* displays:                              Displays.            (line   6)
* displays [ms]:                         ms Displays and Keeps.
                                                              (line   6)
* displays, and footnotes [ms]:          ms Footnotes.        (line  24)
* distance to next trap register (.t):   Page Location Traps. (line  97)
* ditroff, the program:                  History.             (line  58)
* diversion name register (.z):          Diversions.          (line  62)
* diversion trap, setting (dt):          Diversion Traps.     (line   7)
* diversion traps:                       Diversion Traps.     (line   6)
* diversion, appending (da):             Diversions.          (line  18)
* diversion, beginning (di):             Diversions.          (line  18)
* diversion, creating alias (als):       Strings.             (line 224)
* diversion, ending (di):                Diversions.          (line  18)
* diversion, nested:                     Diversions.          (line  62)
* diversion, removing (rm):              Strings.             (line 219)
* diversion, renaming (rn):              Strings.             (line 216)
* diversion, stripping final newline:    Strings.             (line 150)
* diversion, top-level:                  Diversions.          (line  12)
* diversion, top-level, and \!:          Diversions.          (line 171)
* diversion, top-level, and \?:          Diversions.          (line 176)
* diversion, top-level, and bp:          Page Control.        (line  25)
* diversion, unformatting (asciify):     Diversions.          (line 195)
* diversion, vertical position in, register (.d): Diversions. (line  62)
* diversions:                            Diversions.          (line   6)
* diversions, and traps:                 Page Location Traps. (line 163)
* diversions, shared name space with macros and strings: Strings.
                                                              (line  94)
* dl register, and da (boxa):            Diversions.          (line  87)
* dn register, and da (boxa):            Diversions.          (line  87)
* documents, multi-file:                 Debugging.           (line  10)
* documents, structuring the source code: Requests.           (line  14)
* double quote, in a macro argument:     Request and Macro Arguments.
                                                              (line  26)
* double-spacing (ls) <1>:               Manipulating Spacing.
                                                              (line  52)
* double-spacing (ls):                   Basics.              (line  85)
* double-spacing (vs, pvs):              Changing Type Sizes. (line 124)
* drawing a circle (\D'c ...'):          Drawing Requests.    (line 113)
* drawing a line (\D'l ...'):            Drawing Requests.    (line  83)
* drawing a polygon (\D'p ...'):         Drawing Requests.    (line 162)
* drawing a solid circle (\D'C ...'):    Drawing Requests.    (line 118)
* drawing a solid ellipse (\D'E ...'):   Drawing Requests.    (line 128)
* drawing a solid polygon (\D'P ...'):   Drawing Requests.    (line 171)
* drawing a spline (\D'~ ...'):          Drawing Requests.    (line 140)
* drawing an arc (\D'a ...'):            Drawing Requests.    (line 132)
* drawing an ellipse (\D'e ...'):        Drawing Requests.    (line 122)
* drawing color name register (.m):      Colors.              (line  70)
* drawing horizontal lines (\l):         Drawing Requests.    (line  17)
* drawing requests:                      Drawing Requests.    (line   6)
* drawing vertical lines (\L):           Drawing Requests.    (line  51)
* ds request, and comments:              Strings.             (line  42)
* ds request, and double quotes:         Request and Macro Arguments.
                                                              (line  73)
* ds request, and leading spaces:        Strings.             (line  56)
* ds, ds1 requests, and comments:        Comments.            (line  16)
* ds, ds1 requests, and warnings:        Warnings.            (line  54)
* dumping number registers (pnr):        Debugging.           (line  75)
* dumping symbol table (pm):             Debugging.           (line  64)
* dumping traps (ptr):                   Debugging.           (line  79)
* EBCDIC encoding:                       Tab Stops.           (line   6)
* EBCDIC encoding of a tab:              Tabs and Fields.     (line   6)
* EBCDIC encoding of backspace:          Identifiers.         (line  12)
* EBCDIC, input encoding:                Input Encodings.     (line   9)
* EBCDIC, output encoding:               Groff Options.       (line 154)
* el request, and warnings:              Warnings.            (line  32)
* ellipse, drawing (\D'e ...'):          Drawing Requests.    (line 122)
* ellipse, solid, drawing (\D'E ...'):   Drawing Requests.    (line 128)
* em glyph, and cflags:                  Using Symbols.       (line 257)
* em unit (m):                           Measurements.        (line  49)
* embedded commands:                     Embedded Commands.   (line   6)
* embedding PostScript:                  Embedding PostScript.
                                                              (line   6)
* embolding of special fonts:            Artificial Fonts.    (line 116)
* empty line:                            Implicit Line Breaks.
                                                              (line  10)
* empty line (sp):                       Basics.              (line  95)
* empty space before a paragraph [man]:  Miscellaneous man macros.
                                                              (line  15)
* en unit (n):                           Measurements.        (line  54)
* enabling vertical position traps (vpt): Page Location Traps.
                                                              (line  18)
* encoding, EBCDIC:                      Tab Stops.           (line   6)
* encoding, input, cp1047:               Input Encodings.     (line   9)
* encoding, input, EBCDIC:               Input Encodings.     (line   9)
* encoding, input, latin-1 (ISO 8859-1): Input Encodings.     (line  14)
* encoding, input, latin-2 (ISO 8859-2): Input Encodings.     (line  18)
* encoding, input, latin-9 (latin-0, ISO 8859-15): Input Encodings.
                                                              (line  23)
* encoding, output, ASCII:               Groff Options.       (line 142)
* encoding, output, cp1047:              Groff Options.       (line 154)
* encoding, output, EBCDIC:              Groff Options.       (line 154)
* encoding, output, latin-1 (ISO 8859-1): Groff Options.      (line 146)
* encoding, output, utf-8:               Groff Options.       (line 150)
* end of conditional block (\}):         if-else.             (line  38)
* end-of-input macro (em):               End-of-input Traps.  (line   7)
* end-of-input trap, setting (em):       End-of-input Traps.  (line   7)
* end-of-input traps:                    End-of-input Traps.  (line   6)
* end-of-sentence characters:            Using Symbols.       (line 249)
* ending diversion (di):                 Diversions.          (line  18)
* environment number/name register (.ev): Environments.       (line  39)
* environment variables:                 Environment.         (line   6)
* environment, copying (evc):            Environments.        (line  72)
* environment, dimensions of last glyph (.w, .cht, .cdp, .csk): Environments.
                                                              (line  97)
* environment, previous line length (.n): Environments.       (line 112)
* environment, switching (ev):           Environments.        (line  39)
* environments:                          Environments.        (line   6)
* eqn, the program:                      geqn.                (line   6)
* equations [ms]:                        ms Insertions.       (line   6)
* escape character, changing (ec):       Character Translations.
                                                              (line  47)
* escape character, while defining glyph: Using Symbols.      (line 284)
* escapes:                               Escapes.             (line   6)
* escaping newline characters, in strings: Strings.           (line  63)
* ex request, use in debugging:          Debugging.           (line  45)
* ex request, used with nx and rd:       I/O.                 (line 116)
* example markup, bulleted list [ms]:    Lists in ms.         (line  23)
* example markup, glossary-style list [ms]: Lists in ms.      (line  71)
* example markup, multi-page table [ms]: Example multi-page table.
                                                              (line   6)
* example markup, numbered list [ms]:    Lists in ms.         (line  45)
* example markup, title page:            ms Cover Page Macros.
                                                              (line  67)
* examples of invocation:                Invocation Examples. (line   6)
* exiting (ex):                          Debugging.           (line  45)
* expansion of strings (\*):             Strings.             (line  15)
* explicit hyphen (\%):                  Manipulating Hyphenation.
                                                              (line  47)
* expression, order of evaluation:       Expressions.         (line  41)
* expressions:                           Expressions.         (line   6)
* expressions, and space characters:     Expressions.         (line  68)
* extra post-vertical line space (\x):   Changing Type Sizes. (line 117)
* extra post-vertical line space register (.a): Manipulating Spacing.
                                                              (line  83)
* extra pre-vertical line space (\x):    Changing Type Sizes. (line 108)
* extra spaces:                          Filling and Adjusting.
                                                              (line  10)
* extremum operators (>?, <?):           Expressions.         (line  26)
* f unit:                                Measurements.        (line  42)
* f unit, and colors:                    Colors.              (line  35)
* fallback character, defining (fchar, fschar, schar): Using Symbols.
                                                              (line 284)
* fallback glyph, removing definition (rchar, rfschar): Using Symbols.
                                                              (line 341)
* fam request, and changing fonts:       Changing Fonts.      (line  11)
* fam request, and font positions:       Font Positions.      (line  61)
* families, font:                        Font Families.       (line   6)
* FDL, GNU Free Documentation License:   GNU Free Documentation License.
                                                              (line   6)
* features, common:                      Common Features.     (line   6)
* fi request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* field delimiting character (fc):       Fields.              (line   6)
* field padding character (fc):          Fields.              (line   6)
* fields:                                Fields.              (line   6)
* fields, and tabs:                      Tabs and Fields.     (line   6)
* figures [ms]:                          ms Insertions.       (line   6)
* file formats:                          File formats.        (line   6)
* file, appending to (opena):            I/O.                 (line 199)
* file, closing (close):                 I/O.                 (line 230)
* file, inclusion (so):                  I/O.                 (line   9)
* file, opening (open):                  I/O.                 (line 199)
* file, processing next (nx):            I/O.                 (line  74)
* file, writing to (write):              I/O.                 (line 211)
* files, font:                           Font Files.          (line   6)
* files, macro, searching:               Macro Directories.   (line  11)
* fill color name register (.M):         Colors.              (line 100)
* fill colors, unnamed (\D'F...'):       Drawing Requests.    (line 206)
* fill mode <1>:                         Warnings.            (line  23)
* fill mode <2>:                         Manipulating Filling and Adjusting.
                                                              (line 141)
* fill mode:                             Implicit Line Breaks.
                                                              (line  15)
* fill mode (fi):                        Manipulating Filling and Adjusting.
                                                              (line  31)
* fill mode, and \c:                     Line Control.        (line  74)
* filling:                               Filling and Adjusting.
                                                              (line   6)
* filling and adjusting, manipulating:   Manipulating Filling and Adjusting.
                                                              (line   6)
* final newline, stripping in diversions: Strings.            (line 150)
* fl request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* floating keep:                         Displays.            (line  23)
* flush output (fl):                     Debugging.           (line  85)
* font description file, format <1>:     Font File Format.    (line   6)
* font description file, format:         DESC File Format.    (line   6)
* font directories:                      Font Directories.    (line   6)
* font families:                         Font Families.       (line   6)
* font family, changing (fam, \F):       Font Families.       (line  24)
* font file, format:                     Font File Format.    (line   6)
* font files:                            Font Files.          (line   6)
* font files, comments:                  Font File Format.    (line  36)
* font for underlining (uf):             Artificial Fonts.    (line  91)
* font height, changing (\H):            Artificial Fonts.    (line  16)
* font path:                             Font Directories.    (line  14)
* font position register (.f):           Font Positions.      (line  19)
* font position, changing (\f):          Font Positions.      (line  61)
* font positions:                        Font Positions.      (line   6)
* font selection [man]:                  Man font macros.     (line   6)
* font slant, changing (\S):             Artificial Fonts.    (line  46)
* font style, changing (sty):            Font Families.       (line  61)
* font styles:                           Font Families.       (line   6)
* font, mounting (fp):                   Font Positions.      (line  13)
* font, previous (ft, \f[], \fP):        Changing Fonts.      (line  19)
* fonts <1>:                             Changing Fonts.      (line   6)
* fonts:                                 Fonts and Symbols.   (line   6)
* fonts, artificial:                     Artificial Fonts.    (line   6)
* fonts, changing (ft, \f):              Changing Fonts.      (line  11)
* fonts, PostScript:                     Font Families.       (line  11)
* fonts, searching:                      Font Directories.    (line   6)
* fonts, special:                        Special Fonts.       (line   6)
* footers <1>:                           Page Location Traps. (line  37)
* footers:                               Page Layout.         (line  31)
* footers [ms]:                          ms Headers and Footers.
                                                              (line   6)
* footnotes:                             Footnotes and Annotations.
                                                              (line   6)
* footnotes [ms]:                        ms Footnotes.        (line   6)
* footnotes, and displays [ms]:          ms Footnotes.        (line  24)
* footnotes, and keeps [ms]:             ms Footnotes.        (line  24)
* form letters:                          I/O.                 (line  99)
* format of font description file:       DESC File Format.    (line   6)
* format of font description files:      Font File Format.    (line   6)
* format of font files:                  Font File Format.    (line   6)
* format of register (\g):               Assigning Formats.   (line  77)
* formats, assigning (af):               Assigning Formats.   (line   6)
* formats, file:                         File formats.        (line   6)
* fp request, and font translations:     Changing Fonts.      (line  53)
* fp request, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  86)
* fractional point sizes <1>:            Implementation Differences.
                                                              (line  76)
* fractional point sizes:                Fractional Type Sizes.
                                                              (line   6)
* fractional type sizes <1>:             Implementation Differences.
                                                              (line  76)
* fractional type sizes:                 Fractional Type Sizes.
                                                              (line   6)
* french-spacing:                        Sentences.           (line  12)
* fspecial request, and font styles:     Font Families.       (line  61)
* fspecial request, and font translations: Changing Fonts.    (line  53)
* fspecial request, and glyph search order: Using Symbols.    (line  15)
* fspecial request, and imitating bold:  Artificial Fonts.    (line 116)
* ft request, and font translations:     Changing Fonts.      (line  53)
* geqn, invoking:                        Invoking geqn.       (line   6)
* geqn, the program:                     geqn.                (line   6)
* GGL (groff glyph list):                Using Symbols.       (line  94)
* ggrn, invoking:                        Invoking ggrn.       (line   6)
* ggrn, the program:                     ggrn.                (line   6)
* glossary-style list, example markup [ms]: Lists in ms.      (line  71)
* glyph:                                 Using Symbols.       (line   6)
* glyph for line drawing:                Drawing Requests.    (line  51)
* glyph names, composite:                Using Symbols.       (line  94)
* glyph pile (\b):                       Drawing Requests.    (line 223)
* glyph properties (cflags):             Using Symbols.       (line 241)
* glyph, box rule (\[br]):               Drawing Requests.    (line  51)
* glyph, constant space:                 Artificial Fonts.    (line 127)
* glyph, defining (char):                Using Symbols.       (line 284)
* glyph, for line drawing:               Drawing Requests.    (line  28)
* glyph, for margins (mc):               Miscellaneous.       (line  76)
* glyph, italic correction (\/):         Ligatures and Kerning.
                                                              (line  80)
* glyph, last, dimensions (.w, .cht, .cdp, .csk): Environments.
                                                              (line  97)
* glyph, leader repetition (lc):         Leaders.             (line  23)
* glyph, left italic correction (\,):    Ligatures and Kerning.
                                                              (line  92)
* glyph, numbered (\N) <1>:              Using Symbols.       (line 207)
* glyph, numbered (\N):                  Character Translations.
                                                              (line 164)
* glyph, removing definition (rchar, rfschar): Using Symbols. (line 341)
* glyph, soft hyphen (hy):               Manipulating Hyphenation.
                                                              (line 240)
* glyph, tab repetition (tc):            Tabs and Fields.     (line 139)
* glyph, underscore (\[ru]):             Drawing Requests.    (line  28)
* glyphs, available, list (`groff_char(7)' man page): Using Symbols.
                                                              (line  80)
* glyphs, output, and input characters, compatibility with AT&T troff: Implementation Differences.
                                                              (line  86)
* glyphs, overstriking (\o):             Page Motions.        (line 218)
* glyphs, unnamed:                       Using Symbols.       (line 218)
* glyphs, unnamed, accessing with \N:    Font File Format.    (line  51)
* GNU-specific register (.g):            Built-in Registers.  (line  99)
* gpic, invoking:                        Invoking gpic.       (line   6)
* gpic, the program:                     gpic.                (line   6)
* grap, the program:                     grap.                (line   6)
* gray shading (\D'f ...'):              Drawing Requests.    (line 145)
* grefer, invoking:                      Invoking grefer.     (line   6)
* grefer, the program:                   grefer.              (line   6)
* grn, the program:                      ggrn.                (line   6)
* grodvi, invoking:                      Invoking grodvi.     (line   6)
* grodvi, the program:                   grodvi.              (line   6)
* groff - what is it?:                   What Is groff?.      (line   6)
* groff capabilities:                    groff Capabilities.  (line   6)
* groff glyph list (GGL):                Using Symbols.       (line  94)
* groff invocation:                      Invoking groff.      (line   6)
* groff, and pi request:                 I/O.                 (line 155)
* GROFF_BIN_PATH, environment variable:  Environment.         (line  33)
* GROFF_COMMAND_PREFIX, environment variable: Environment.    (line  10)
* GROFF_FONT_PATH, environment variable <1>: Font Directories.
                                                              (line  26)
* GROFF_FONT_PATH, environment variable: Environment.         (line  28)
* GROFF_TMAC_PATH, environment variable <1>: Macro Directories.
                                                              (line  18)
* GROFF_TMAC_PATH, environment variable: Environment.         (line  20)
* GROFF_TMPDIR, environment variable:    Environment.         (line  37)
* GROFF_TYPESETTER, environment variable: Environment.        (line  25)
* grohtml, invoking:                     Invoking grohtml.    (line   6)
* grohtml, registers and strings:        grohtml specific registers and strings.
                                                              (line   6)
* grohtml, the program <1>:              grohtml.             (line   6)
* grohtml, the program:                  Groff Options.       (line 165)
* grolbp, invoking:                      Invoking grolbp.     (line   6)
* grolbp, the program:                   grolbp.              (line   6)
* grolj4, invoking:                      Invoking grolj4.     (line   6)
* grolj4, the program:                   grolj4.              (line   6)
* grops, invoking:                       Invoking grops.      (line   6)
* grops, the program:                    grops.               (line   6)
* grotty, invoking:                      Invoking grotty.     (line   6)
* grotty, the program:                   grotty.              (line   6)
* gsoelim, invoking:                     Invoking gsoelim.    (line   6)
* gsoelim, the program:                  gsoelim.             (line   6)
* gtbl, invoking:                        Invoking gtbl.       (line   6)
* gtbl, the program:                     gtbl.                (line   6)
* gtroff, identification register (.g):  Built-in Registers.  (line  99)
* gtroff, interactive use:               Debugging.           (line  85)
* gtroff, output:                        gtroff Output.       (line   6)
* gtroff, process ID register ($$):      Built-in Registers.  (line  96)
* gtroff, reference:                     gtroff Reference.    (line   6)
* gxditview, invoking:                   Invoking gxditview.  (line   6)
* gxditview, the program:                gxditview.           (line   6)
* hanging indentation [man]:             Man usage.           (line  98)
* hcode request, and glyph definitions:  Using Symbols.       (line 284)
* headers <1>:                           Page Location Traps. (line  37)
* headers:                               Page Layout.         (line  31)
* headers [ms]:                          ms Headers and Footers.
                                                              (line   6)
* height, font, changing (\H):           Artificial Fonts.    (line  16)
* height, of last glyph (.cht):          Environments.        (line  97)
* high-water mark register (.h):         Diversions.          (line  69)
* history:                               History.             (line   6)
* home directory:                        Macro Directories.   (line  24)
* horizontal discardable space:          Manipulating Filling and Adjusting.
                                                              (line 167)
* horizontal input line position register (hp): Page Motions. (line 211)
* horizontal input line position, saving (\k): Page Motions.  (line 205)
* horizontal line, drawing (\l):         Drawing Requests.    (line  17)
* horizontal motion (\h):                Page Motions.        (line 112)
* horizontal output line position register (.k): Page Motions.
                                                              (line 214)
* horizontal resolution:                 DESC File Format.    (line  14)
* horizontal resolution register (.H):   Built-in Registers.  (line  15)
* horizontal space (\h):                 Page Motions.        (line 112)
* horizontal space, unformatting:        Strings.             (line 150)
* hours, current time (hours):           Built-in Registers.  (line  35)
* hpf request, and hyphenation language: Manipulating Hyphenation.
                                                              (line 254)
* hw request, and hyphenation language:  Manipulating Hyphenation.
                                                              (line 254)
* hy glyph, and cflags:                  Using Symbols.       (line 257)
* hyphen, explicit (\%):                 Manipulating Hyphenation.
                                                              (line  47)
* hyphenated lines, consecutive (hlm):   Manipulating Hyphenation.
                                                              (line  47)
* hyphenating characters:                Using Symbols.       (line 253)
* hyphenation:                           Hyphenation.         (line   6)
* hyphenation character (\%):            Manipulating Hyphenation.
                                                              (line  85)
* hyphenation code (hcode):              Manipulating Hyphenation.
                                                              (line 174)
* hyphenation language register (.hla):  Manipulating Hyphenation.
                                                              (line 261)
* hyphenation margin (hym):              Manipulating Hyphenation.
                                                              (line 210)
* hyphenation margin register (.hym):    Manipulating Hyphenation.
                                                              (line 220)
* hyphenation patterns (hpf):            Manipulating Hyphenation.
                                                              (line 116)
* hyphenation restrictions register (.hy): Manipulating Hyphenation.
                                                              (line  30)
* hyphenation space (hys):               Manipulating Hyphenation.
                                                              (line 225)
* hyphenation space register (.hys):     Manipulating Hyphenation.
                                                              (line 236)
* hyphenation, disabling (\%):           Manipulating Hyphenation.
                                                              (line  85)
* hyphenation, manipulating:             Manipulating Hyphenation.
                                                              (line   6)
* i unit:                                Measurements.        (line  22)
* i/o:                                   I/O.                 (line   6)
* IBM cp1047 input encoding:             Input Encodings.     (line   9)
* IBM cp1047 output encoding:            Groff Options.       (line 154)
* identifiers:                           Identifiers.         (line   6)
* identifiers, undefined:                Identifiers.         (line  81)
* ie request, and font translations:     Changing Fonts.      (line  53)
* ie request, and warnings:              Warnings.            (line  32)
* if request, and font translations:     Changing Fonts.      (line  53)
* if request, and the ! operator:        Expressions.         (line  21)
* if request, operators to use with:     Operators in Conditionals.
                                                              (line   6)
* if-else:                               if-else.             (line   6)
* imitating bold face (bd):              Artificial Fonts.    (line  98)
* implementation differences:            Implementation Differences.
                                                              (line   6)
* implicit breaks of lines:              Implicit Line Breaks.
                                                              (line   6)
* implicit line breaks:                  Implicit Line Breaks.
                                                              (line   6)
* in request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* in request, using + and -:             Expressions.         (line  57)
* inch unit (i):                         Measurements.        (line  22)
* including a file (so):                 I/O.                 (line   9)
* incompatibilities with AT&T troff:     Implementation Differences.
                                                              (line   6)
* increment value without changing the register: Auto-increment.
                                                              (line  53)
* increment, automatic:                  Auto-increment.      (line   6)
* indentaion, resetting to default [man]: Man usage.          (line 127)
* indentation (in):                      Line Layout.         (line  26)
* index, in macro package:               Indices.             (line   6)
* indirect assignments:                  Interpolating Registers.
                                                              (line  11)
* input and output requests:             I/O.                 (line   6)
* input characters and output glyphs, compatibility with AT&T troff: Implementation Differences.
                                                              (line  86)
* input characters, invalid:             Identifiers.         (line  15)
* input conventions:                     Input Conventions.   (line   6)
* input encoding, cp1047:                Input Encodings.     (line   9)
* input encoding, EBCDIC:                Input Encodings.     (line   9)
* input encoding, latin-1 (ISO 8859-1):  Input Encodings.     (line  14)
* input encoding, latin-2 (ISO 8859-2):  Input Encodings.     (line  18)
* input encoding, latin-9 (latin-9, ISO 8859-15): Input Encodings.
                                                              (line  23)
* input file name, current, register (.F): Built-in Registers.
                                                              (line  12)
* input level in delimited arguments:    Implementation Differences.
                                                              (line  45)
* input line continuation (\):           Line Control.        (line  39)
* input line number register (.c, c.):   Built-in Registers.  (line  74)
* input line number, setting (lf):       Debugging.           (line  10)
* input line position, horizontal, saving (\k): Page Motions. (line 205)
* input line trap, setting (it):         Input Line Traps.    (line   8)
* input line traps:                      Input Line Traps.    (line   6)
* input line traps and interrupted lines (itc): Input Line Traps.
                                                              (line  25)
* input line, horizontal position, register (hp): Page Motions.
                                                              (line 211)
* input stack, backtrace (backtrace):    Debugging.           (line  94)
* input stack, setting limit:            Debugging.           (line 119)
* input token:                           Gtroff Internals.    (line   6)
* input, 8-bit:                          Font File Format.    (line  51)
* input, standard, reading from (rd):    I/O.                 (line  79)
* inserting horizontal space (\h):       Page Motions.        (line 112)
* installation:                          Installation.        (line   6)
* interactive use of gtroff:             Debugging.           (line  85)
* intermediate output:                   gtroff Output.       (line  16)
* interpolating registers (\n):          Interpolating Registers.
                                                              (line   6)
* interpolation of strings (\*):         Strings.             (line  15)
* interrupted line:                      Line Control.        (line  39)
* interrupted line register (.int):      Line Control.        (line  88)
* interrupted lines and input line traps (itc): Input Line Traps.
                                                              (line  25)
* introduction:                          Introduction.        (line   6)
* invalid characters for trf request:    I/O.                 (line  67)
* invalid input characters:              Identifiers.         (line  15)
* invocation examples:                   Invocation Examples. (line   6)
* invoking geqn:                         Invoking geqn.       (line   6)
* invoking ggrn:                         Invoking ggrn.       (line   6)
* invoking gpic:                         Invoking gpic.       (line   6)
* invoking grefer:                       Invoking grefer.     (line   6)
* invoking grodvi:                       Invoking grodvi.     (line   6)
* invoking groff:                        Invoking groff.      (line   6)
* invoking grohtml:                      Invoking grohtml.    (line   6)
* invoking grolbp:                       Invoking grolbp.     (line   6)
* invoking grolj4:                       Invoking grolj4.     (line   6)
* invoking grops:                        Invoking grops.      (line   6)
* invoking grotty:                       Invoking grotty.     (line   6)
* invoking gsoelim:                      Invoking gsoelim.    (line   6)
* invoking gtbl:                         Invoking gtbl.       (line   6)
* invoking gxditview:                    Invoking gxditview.  (line   6)
* ISO 8859-1 (latin-1), input encoding:  Input Encodings.     (line  14)
* ISO 8859-1 (latin-1), output encoding: Groff Options.       (line 146)
* ISO 8859-15 (latin-9, latin-0), input encoding: Input Encodings.
                                                              (line  23)
* ISO 8859-2 (latin-2), input encoding:  Input Encodings.     (line  18)
* italic correction (\/):                Ligatures and Kerning.
                                                              (line  80)
* italic fonts [man]:                    Man font macros.     (line  53)
* italic glyph, correction after roman glyph (\,): Ligatures and Kerning.
                                                              (line  92)
* italic glyph, correction before roman glyph (\/): Ligatures and Kerning.
                                                              (line  80)
* justifying text:                       Manipulating Filling and Adjusting.
                                                              (line   6)
* justifying text (rj):                  Manipulating Filling and Adjusting.
                                                              (line 239)
* keep:                                  Displays.            (line  18)
* keep, floating:                        Displays.            (line  23)
* keeps [ms]:                            ms Displays and Keeps.
                                                              (line   6)
* keeps, and footnotes [ms]:             ms Footnotes.        (line  24)
* kerning and ligatures:                 Ligatures and Kerning.
                                                              (line   6)
* kerning enabled register (.kern):      Ligatures and Kerning.
                                                              (line  42)
* kerning, activating (kern):            Ligatures and Kerning.
                                                              (line  42)
* kerning, track:                        Ligatures and Kerning.
                                                              (line  53)
* landscape page orientation:            Paper Size.          (line   6)
* last glyph, dimensions (.w, .cht, .cdp, .csk): Environments.
                                                              (line  97)
* last-requested point size registers (.psr, .sr): Fractional Type Sizes.
                                                              (line  43)
* latin-1 (ISO 8859-1), input encoding:  Input Encodings.     (line  14)
* latin-1 (ISO 8859-1), output encoding: Groff Options.       (line 146)
* latin-2 (ISO 8859-2), input encoding:  Input Encodings.     (line  18)
* latin-9 (latin-0, ISO 8859-15), input encoding: Input Encodings.
                                                              (line  23)
* layout, line:                          Line Layout.         (line   6)
* layout, page:                          Page Layout.         (line   6)
* lc request, and glyph definitions:     Using Symbols.       (line 284)
* leader character:                      Leaders.             (line  12)
* leader character, and translations:    Character Translations.
                                                              (line 173)
* leader character, non-interpreted (\a): Leaders.            (line  18)
* leader repetition character (lc):      Leaders.             (line  23)
* leaders:                               Leaders.             (line   6)
* leading:                               Sizes.               (line  15)
* leading spaces:                        Filling and Adjusting.
                                                              (line  10)
* leading spaces with ds:                Strings.             (line  56)
* left italic correction (\,):           Ligatures and Kerning.
                                                              (line  92)
* left margin (po):                      Line Layout.         (line  22)
* left margin, how to move [man]:        Man usage.           (line 106)
* length of a string (length):           Strings.             (line 204)
* length of line (ll):                   Line Layout.         (line  30)
* length of page (pl):                   Page Layout.         (line  13)
* length of previous line (.n):          Environments.        (line 112)
* length of title line (lt):             Page Layout.         (line  63)
* letters, form:                         I/O.                 (line  99)
* level of warnings (warn):              Debugging.           (line 155)
* ligature:                              Using Symbols.       (line   6)
* ligatures and kerning:                 Ligatures and Kerning.
                                                              (line   6)
* ligatures enabled register (.lg):      Ligatures and Kerning.
                                                              (line  24)
* ligatures, activating (lg):            Ligatures and Kerning.
                                                              (line  24)
* limitations of \b escape:              Drawing Requests.    (line 231)
* line break <1>:                        Manipulating Filling and Adjusting.
                                                              (line   6)
* line break <2>:                        Implicit Line Breaks.
                                                              (line   6)
* line break:                            Basics.              (line  51)
* line break (br):                       Basics.              (line 122)
* line breaks, with vertical space [man]: Man usage.          (line 120)
* line breaks, without vertical space [man]: Man usage.       (line 124)
* line control:                          Line Control.        (line   6)
* line dimensions:                       Line Layout.         (line   6)
* line drawing glyph:                    Drawing Requests.    (line  28)
* line indentation (in):                 Line Layout.         (line  26)
* line layout:                           Line Layout.         (line   6)
* line length (ll):                      Line Layout.         (line  30)
* line length register (.l):             Line Layout.         (line 163)
* line length, previous (.n):            Environments.        (line 112)
* line number, input, register (.c, c.): Built-in Registers.  (line  74)
* line number, output, register (ln):    Built-in Registers.  (line  79)
* line numbers, printing (nm):           Miscellaneous.       (line  10)
* line space, extra post-vertical (\x):  Changing Type Sizes. (line 117)
* line space, extra pre-vertical (\x):   Changing Type Sizes. (line 108)
* line spacing register (.L):            Manipulating Spacing.
                                                              (line  64)
* line spacing, post-vertical (pvs):     Changing Type Sizes. (line 121)
* line thickness (\D't ...'):            Drawing Requests.    (line 196)
* line, blank:                           Implicit Line Breaks.
                                                              (line  10)
* line, drawing (\D'l ...'):             Drawing Requests.    (line  83)
* line, empty (sp):                      Basics.              (line  95)
* line, horizontal, drawing (\l):        Drawing Requests.    (line  17)
* line, implicit breaks:                 Implicit Line Breaks.
                                                              (line   6)
* line, input, continuation (\):         Line Control.        (line  39)
* line, input, horizontal position, register (hp): Page Motions.
                                                              (line 211)
* line, input, horizontal position, saving (\k): Page Motions.
                                                              (line 205)
* line, interrupted:                     Line Control.        (line  39)
* line, output, continuation (\c):       Line Control.        (line  39)
* line, output, horizontal position, register (.k): Page Motions.
                                                              (line 214)
* line, vertical, drawing (\L):          Drawing Requests.    (line  51)
* line-tabs mode:                        Tabs and Fields.     (line 148)
* lines, blank, disabling:               Manipulating Spacing.
                                                              (line 115)
* lines, centering (ce) <1>:             Manipulating Filling and Adjusting.
                                                              (line 190)
* lines, centering (ce):                 Basics.              (line 108)
* lines, consecutive hyphenated (hlm):   Manipulating Hyphenation.
                                                              (line  47)
* lines, interrupted, and input line traps (itc): Input Line Traps.
                                                              (line  25)
* list:                                  Displays.            (line  13)
* list of available glyphs (`groff_char(7)' man page): Using Symbols.
                                                              (line  80)
* ll request, using + and -:             Expressions.         (line  57)
* location, vertical, page, marking (mk): Page Motions.       (line  11)
* location, vertical, page, returning to marked (rt): Page Motions.
                                                              (line  11)
* logical operators:                     Expressions.         (line  19)
* long names:                            Implementation Differences.
                                                              (line   9)
* loops and conditionals:                Conditionals and Loops.
                                                              (line   6)
* lq glyph, and lq string [man]:         Predefined man strings.
                                                              (line  22)
* ls request, alternative to (pvs):      Changing Type Sizes. (line 136)
* lt request, using + and -:             Expressions.         (line  57)
* M unit:                                Measurements.        (line  61)
* m unit:                                Measurements.        (line  49)
* machine unit (u):                      Measurements.        (line   6)
* macro arguments:                       Request and Macro Arguments.
                                                              (line   6)
* macro arguments, and compatibility mode: Gtroff Internals.  (line  93)
* macro basics:                          Basics.              (line   6)
* macro directories:                     Macro Directories.   (line   6)
* macro files, searching:                Macro Directories.   (line  11)
* macro name register (\$0):             Parameters.          (line  48)
* macro names, starting with [ or ], and refer: Identifiers.  (line  48)
* macro packages <1>:                    Macro Packages.      (line   6)
* macro packages:                        Macro Package Intro. (line   6)
* macro packages, structuring the source code: Requests.      (line  14)
* macro, appending (am):                 Writing Macros.      (line 110)
* macro, arguments (\$):                 Parameters.          (line  21)
* macro, creating alias (als):           Strings.             (line 224)
* macro, end-of-input (em):              End-of-input Traps.  (line   7)
* macro, removing (rm):                  Strings.             (line 219)
* macro, renaming (rn):                  Strings.             (line 216)
* macros:                                Macros.              (line   6)
* macros for manual pages [man]:         Man usage.           (line   6)
* macros, recursive:                     while.               (line  40)
* macros, searching:                     Macro Directories.   (line   6)
* macros, shared name space with strings and diversions: Strings.
                                                              (line  94)
* macros, tutorial for users:            Tutorial for Macro Users.
                                                              (line   6)
* macros, writing:                       Writing Macros.      (line   6)
* major quotes:                          Displays.            (line  10)
* major version number register (.x):    Built-in Registers.  (line  85)
* man macros:                            Man usage.           (line   6)
* man macros, bold face:                 Man font macros.     (line  14)
* man macros, custom headers and footers: Optional man extensions.
                                                              (line  12)
* man macros, default indentation:       Miscellaneous man macros.
                                                              (line   6)
* man macros, empty space before a paragraph: Miscellaneous man macros.
                                                              (line  15)
* man macros, hanging indentation:       Man usage.           (line  98)
* man macros, how to set fonts:          Man font macros.     (line   6)
* man macros, italic fonts:              Man font macros.     (line  53)
* man macros, line breaks with vertical space: Man usage.     (line 120)
* man macros, line breaks without vertical space: Man usage.  (line 124)
* man macros, moving left margin:        Man usage.           (line 106)
* man macros, resetting default indentation: Man usage.       (line 127)
* man macros, tab stops:                 Miscellaneous man macros.
                                                              (line  10)
* man macros, Ultrix-specific:           Optional man extensions.
                                                              (line  30)
* man pages:                             man.                 (line   6)
* manipulating filling and adjusting:    Manipulating Filling and Adjusting.
                                                              (line   6)
* manipulating hyphenation:              Manipulating Hyphenation.
                                                              (line   6)
* manipulating spacing:                  Manipulating Spacing.
                                                              (line   6)
* manmacros, BSD compatibility:          Miscellaneous man macros.
                                                              (line  26)
* manual pages:                          man.                 (line   6)
* margin for hyphenation (hym):          Manipulating Hyphenation.
                                                              (line 210)
* margin glyph (mc):                     Miscellaneous.       (line  76)
* margin, bottom:                        Page Layout.         (line  20)
* margin, left (po):                     Line Layout.         (line  22)
* margin, top:                           Page Layout.         (line  20)
* mark, high-water, register (.h):       Diversions.          (line  69)
* marking vertical page location (mk):   Page Motions.        (line  11)
* maximum values of Roman numerals:      Assigning Formats.   (line  60)
* mdoc macros:                           mdoc.                (line   6)
* me macro package:                      me.                  (line   6)
* measurement unit:                      Measurements.        (line   6)
* measurements:                          Measurements.        (line   6)
* measurements, specifying safely:       Default Units.       (line  25)
* minimum values of Roman numerals:      Assigning Formats.   (line  60)
* minor version number register (.y):    Built-in Registers.  (line  89)
* minutes, current time (minutes):       Built-in Registers.  (line  31)
* mm macro package:                      mm.                  (line   6)
* mode for constant glyph space (cs):    Artificial Fonts.    (line 127)
* mode, compatibility:                   Implementation Differences.
                                                              (line   6)
* mode, compatibility, and parameters:   Gtroff Internals.    (line  93)
* mode, copy-in:                         Copy-in Mode.        (line   6)
* mode, copy-in, and write requests:     I/O.                 (line 211)
* mode, fill <1>:                        Warnings.            (line  23)
* mode, fill <2>:                        Manipulating Filling and Adjusting.
                                                              (line 141)
* mode, fill:                            Implicit Line Breaks.
                                                              (line  15)
* mode, fill (fi):                       Manipulating Filling and Adjusting.
                                                              (line  31)
* mode, fill, and \c:                    Line Control.        (line  74)
* mode, line-tabs:                       Tabs and Fields.     (line 148)
* mode, no-fill (nf):                    Manipulating Filling and Adjusting.
                                                              (line  41)
* mode, no-fill, and \c:                 Line Control.        (line  64)
* mode, no-space (ns):                   Manipulating Spacing.
                                                              (line 115)
* mode, nroff:                           Troff and Nroff Mode.
                                                              (line   6)
* mode, safer <1>:                       I/O.                 (line  33)
* mode, safer <2>:                       Built-in Registers.  (line  18)
* mode, safer <3>:                       Macro Directories.   (line  21)
* mode, safer:                           Groff Options.       (line 194)
* mode, troff:                           Troff and Nroff Mode.
                                                              (line   6)
* mode, unsafe <1>:                      I/O.                 (line  33)
* mode, unsafe <2>:                      Built-in Registers.  (line  18)
* mode, unsafe <3>:                      Macro Directories.   (line  21)
* mode, unsafe:                          Groff Options.       (line 199)
* month of the year register (mo):       Built-in Registers.  (line  45)
* motion operators:                      Expressions.         (line  47)
* motion, horizontal (\h):               Page Motions.        (line 112)
* motion, vertical (\v):                 Page Motions.        (line  87)
* motions, page:                         Page Motions.        (line   6)
* mounting font (fp):                    Font Positions.      (line  13)
* ms macros:                             ms.                  (line   6)
* ms macros, accent marks:               ms Strings and Special Characters.
                                                              (line   6)
* ms macros, body text:                  ms Body Text.        (line   6)
* ms macros, cover page:                 ms Cover Page Macros.
                                                              (line   6)
* ms macros, creating table of contents: ms TOC.              (line   6)
* ms macros, differences from AT&T:      Differences from AT&T ms.
                                                              (line   6)
* ms macros, displays:                   ms Displays and Keeps.
                                                              (line   6)
* ms macros, document control registers: ms Document Control Registers.
                                                              (line   6)
* ms macros, equations:                  ms Insertions.       (line   6)
* ms macros, figures:                    ms Insertions.       (line   6)
* ms macros, footers:                    ms Headers and Footers.
                                                              (line   6)
* ms macros, footnotes:                  ms Footnotes.        (line   6)
* ms macros, general structure:          General ms Structure.
                                                              (line   6)
* ms macros, headers:                    ms Headers and Footers.
                                                              (line   6)
* ms macros, headings:                   Headings in ms.      (line   6)
* ms macros, highlighting:               Highlighting in ms.  (line   6)
* ms macros, keeps:                      ms Displays and Keeps.
                                                              (line   6)
* ms macros, lists:                      Lists in ms.         (line   6)
* ms macros, margins:                    ms Margins.          (line   6)
* ms macros, multiple columns:           ms Multiple Columns. (line   6)
* ms macros, naming conventions:         Naming Conventions.  (line   6)
* ms macros, nested lists:               Lists in ms.         (line 132)
* ms macros, page layout:                ms Page Layout.      (line   6)
* ms macros, paragraph handling:         Paragraphs in ms.    (line   6)
* ms macros, references:                 ms Insertions.       (line   6)
* ms macros, special characters:         ms Strings and Special Characters.
                                                              (line   6)
* ms macros, strings:                    ms Strings and Special Characters.
                                                              (line   6)
* ms macros, tables:                     ms Insertions.       (line   6)
* multi-file documents:                  Debugging.           (line  10)
* multi-line strings:                    Strings.             (line  63)
* multi-page table, example markup [ms]: Example multi-page table.
                                                              (line   6)
* multiple columns [ms]:                 ms Multiple Columns. (line   6)
* n unit:                                Measurements.        (line  54)
* name space, common, of macros, diversions, and strings: Strings.
                                                              (line  94)
* name, background color, register (.M): Colors.              (line 100)
* name, drawing color, register (.m):    Colors.              (line  70)
* name, fill color, register (.M):       Colors.              (line 100)
* named character (\C):                  Using Symbols.       (line 191)
* names, long:                           Implementation Differences.
                                                              (line   9)
* naming conventions, ms macros:         Naming Conventions.  (line   6)
* ne request, and the .trunc register:   Page Location Traps. (line 127)
* ne request, comparison with sv:        Page Control.        (line  55)
* negating register values:              Setting Registers.   (line  42)
* nested assignments:                    Interpolating Registers.
                                                              (line  11)
* nested diversions:                     Diversions.          (line  62)
* nested lists [ms]:                     Lists in ms.         (line 132)
* new page (bp) <1>:                     Page Control.        (line  10)
* new page (bp):                         Basics.              (line  93)
* newline character <1>:                 Escapes.             (line  72)
* newline character:                     Identifiers.         (line  10)
* newline character, and translations:   Character Translations.
                                                              (line 173)
* newline character, in strings, escaping: Strings.           (line  63)
* newline, final, stripping in diversions: Strings.           (line 150)
* next file, processing (nx):            I/O.                 (line  74)
* next free font position register (.fp): Font Positions.     (line  30)
* nf request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* nl register, and .d:                   Diversions.          (line  62)
* nl register, difference to .h:         Diversions.          (line  82)
* nm request, using + and -:             Expressions.         (line  57)
* no-break control character ('):        Requests.            (line   6)
* no-break control character, changing (c2): Character Translations.
                                                              (line   6)
* no-fill mode (nf):                     Manipulating Filling and Adjusting.
                                                              (line  41)
* no-fill mode, and \c:                  Line Control.        (line  64)
* no-space mode (ns):                    Manipulating Spacing.
                                                              (line 115)
* node, output:                          Gtroff Internals.    (line   6)
* nr request, and warnings:              Warnings.            (line  61)
* nr request, using + and -:             Expressions.         (line  57)
* nroff mode:                            Troff and Nroff Mode.
                                                              (line   6)
* nroff, the program:                    History.             (line  23)
* number of arguments register (.$):     Parameters.          (line  10)
* number register, creating alias (aln): Setting Registers.   (line  79)
* number register, removing (rr):        Setting Registers.   (line  71)
* number register, renaming (rnn):       Setting Registers.   (line  75)
* number registers, dumping (pnr):       Debugging.           (line  75)
* number, input line, setting (lf):      Debugging.           (line  10)
* number, page (pn):                     Page Layout.         (line  80)
* numbered glyph (\N) <1>:               Using Symbols.       (line 207)
* numbered glyph (\N):                   Character Translations.
                                                              (line 164)
* numbered list, example markup [ms]:    Lists in ms.         (line  45)
* numbers, and delimiters:               Escapes.             (line  68)
* numbers, line, printing (nm):          Miscellaneous.       (line  10)
* numerals, Roman:                       Assigning Formats.   (line  32)
* numeric expression, valid:             Expressions.         (line  65)
* offset, page (po):                     Line Layout.         (line  22)
* open request, and safer mode:          Groff Options.       (line 194)
* opena request, and safer mode:         Groff Options.       (line 194)
* opening file (open):                   I/O.                 (line 199)
* operator, scaling:                     Expressions.         (line  37)
* operators, arithmetic:                 Expressions.         (line   8)
* operators, as delimiters:              Escapes.             (line  70)
* operators, comparison:                 Expressions.         (line  15)
* operators, extremum (>?, <?):          Expressions.         (line  26)
* operators, logical:                    Expressions.         (line  19)
* operators, motion:                     Expressions.         (line  47)
* operators, unary:                      Expressions.         (line  21)
* options:                               Groff Options.       (line   6)
* order of evaluation in expressions:    Expressions.         (line  41)
* orientation, landscape:                Paper Size.          (line   6)
* orphan lines, preventing with ne:      Page Control.        (line  34)
* os request, and no-space mode:         Page Control.        (line  64)
* output and input requests:             I/O.                 (line   6)
* output device name string register (.T) <1>: Built-in Registers.
                                                              (line 119)
* output device name string register (.T): Groff Options.     (line 170)
* output device usage number register (.T): Groff Options.    (line 170)
* output devices <1>:                    Output Devices.      (line   6)
* output devices:                        Output device intro. (line   6)
* output encoding, ASCII:                Groff Options.       (line 142)
* output encoding, cp1047:               Groff Options.       (line 154)
* output encoding, EBCDIC:               Groff Options.       (line 154)
* output encoding, latin-1 (ISO 8859-1): Groff Options.       (line 146)
* output encoding, utf-8:                Groff Options.       (line 150)
* output glyphs, and input characters,compatibility with AT&T troff: Implementation Differences.
                                                              (line  86)
* output line number register (ln):      Built-in Registers.  (line  79)
* output line, continuation (\c):        Line Control.        (line  39)
* output line, horizontal position, register (.k): Page Motions.
                                                              (line 214)
* output node:                           Gtroff Internals.    (line   6)
* output request, and \!:                Diversions.          (line 179)
* output, flush (fl):                    Debugging.           (line  85)
* output, gtroff:                        gtroff Output.       (line   6)
* output, intermediate:                  gtroff Output.       (line  16)
* output, suppressing (\O):              Suppressing output.  (line   7)
* output, transparent (\!, \?):          Diversions.          (line 134)
* output, transparent (cf, trf):         I/O.                 (line  49)
* output, transparent, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line 107)
* output, troff:                         gtroff Output.       (line  16)
* overlapping characters:                Using Symbols.       (line 262)
* overstriking glyphs (\o):              Page Motions.        (line 218)
* P unit:                                Measurements.        (line  34)
* p unit:                                Measurements.        (line  30)
* packages, macros:                      Macro Packages.      (line   6)
* padding character, for fields (fc):    Fields.              (line   6)
* page break, conditional (ne):          Page Control.        (line  34)
* page control:                          Page Control.        (line   6)
* page ejecting register (.pe):          Page Location Traps. (line 139)
* page footers:                          Page Location Traps. (line  37)
* page headers:                          Page Location Traps. (line  37)
* page layout:                           Page Layout.         (line   6)
* page layout [ms]:                      ms Page Layout.      (line   6)
* page length (pl):                      Page Layout.         (line  13)
* page length register (.p):             Page Layout.         (line  17)
* page location traps:                   Page Location Traps. (line   6)
* page location, vertical, marking (mk): Page Motions.        (line  11)
* page location, vertical, returning to marked (rt): Page Motions.
                                                              (line  11)
* page motions:                          Page Motions.        (line   6)
* page number (pn):                      Page Layout.         (line  80)
* page number character (%):             Page Layout.         (line  35)
* page number character, changing (pc):  Page Layout.         (line  89)
* page number register (%):              Page Control.        (line  28)
* page offset (po):                      Line Layout.         (line  22)
* page orientation, landscape:           Paper Size.          (line   6)
* page, new (bp):                        Page Control.        (line  10)
* paper formats:                         Paper Formats.       (line   6)
* paper size:                            Paper Size.          (line   6)
* paragraphs:                            Paragraphs.          (line   6)
* parameters:                            Parameters.          (line   6)
* parameters, and compatibility mode:    Gtroff Internals.    (line  93)
* parentheses:                           Expressions.         (line  41)
* path, for font files:                  Font Directories.    (line  14)
* path, for tmac files:                  Macro Directories.   (line  11)
* patterns for hyphenation (hpf):        Manipulating Hyphenation.
                                                              (line 116)
* pi request, and groff:                 I/O.                 (line 155)
* pi request, and safer mode:            Groff Options.       (line 194)
* pic, the program:                      gpic.                (line   6)
* pica unit (P):                         Measurements.        (line  34)
* pile, glyph (\b):                      Drawing Requests.    (line 223)
* pl request, using + and -:             Expressions.         (line  57)
* planting a trap:                       Traps.               (line  11)
* platform-specific directory:           Macro Directories.   (line  26)
* pn request, using + and -:             Expressions.         (line  57)
* po request, using + and -:             Expressions.         (line  57)
* point size registers (.s, .ps):        Changing Type Sizes. (line  19)
* point size registers, last-requested (.psr, .sr): Fractional Type Sizes.
                                                              (line  43)
* point sizes, changing (ps, \s):        Changing Type Sizes. (line  11)
* point sizes, fractional <1>:           Implementation Differences.
                                                              (line  76)
* point sizes, fractional:               Fractional Type Sizes.
                                                              (line   6)
* point unit (p):                        Measurements.        (line  30)
* polygon, drawing (\D'p ...'):          Drawing Requests.    (line 162)
* polygon, solid, drawing (\D'P ...'):   Drawing Requests.    (line 171)
* position of lowest text line (.h):     Diversions.          (line  69)
* position, absolute, operator (|):      Expressions.         (line  52)
* position, horizontal input line, saving (\k): Page Motions. (line 205)
* position, horizontal, in input line, register (hp): Page Motions.
                                                              (line 211)
* position, horizontal, in output line, register (.k): Page Motions.
                                                              (line 214)
* position, vertical, current (nl):      Page Control.        (line  68)
* position, vertical, in diversion, register (.d): Diversions.
                                                              (line  62)
* positions, font:                       Font Positions.      (line   6)
* post-vertical line spacing:            Changing Type Sizes. (line 121)
* post-vertical line spacing register (.pvs): Changing Type Sizes.
                                                              (line 136)
* post-vertical line spacing, changing (pvs): Changing Type Sizes.
                                                              (line 136)
* postprocessor access:                  Postprocessor Access.
                                                              (line   6)
* postprocessors:                        Output device intro. (line   6)
* PostScript fonts:                      Font Families.       (line  11)
* PostScript, bounding box:              Miscellaneous.       (line 145)
* PostScript, embedding:                 Embedding PostScript.
                                                              (line   6)
* prefix, for commands:                  Environment.         (line  10)
* preprocessor, calling convention:      Preprocessors in man pages.
                                                              (line   6)
* preprocessors <1>:                     Preprocessors.       (line   6)
* preprocessors:                         Preprocessor Intro.  (line   6)
* previous font (ft, \f[], \fP):         Changing Fonts.      (line  19)
* previous line length (.n):             Environments.        (line 112)
* print current page register (.P):      Groff Options.       (line 257)
* printing backslash (\\, \e, \E, \[rs]) <1>: Implementation Differences.
                                                              (line 107)
* printing backslash (\\, \e, \E, \[rs]): Escapes.            (line  77)
* printing line numbers (nm):            Miscellaneous.       (line  10)
* printing to stderr (tm, tm1, tmc):     Debugging.           (line  27)
* printing, zero-width (\z, \Z):         Page Motions.        (line 222)
* process ID of gtroff register ($$):    Built-in Registers.  (line  96)
* processing next file (nx):             I/O.                 (line  74)
* properties of characters (cflags):     Using Symbols.       (line 241)
* properties of glyphs (cflags):         Using Symbols.       (line 241)
* ps request, and constant glyph space mode: Artificial Fonts.
                                                              (line 127)
* ps request, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  76)
* ps request, using + and -:             Expressions.         (line  57)
* ps request, with fractional type sizes: Fractional Type Sizes.
                                                              (line   6)
* pso request, and safer mode:           Groff Options.       (line 194)
* pvs request, using + and -:            Expressions.         (line  57)
* quotes, major:                         Displays.            (line  10)
* quotes, trailing:                      Strings.             (line  56)
* radicalex glyph, and cflags:           Using Symbols.       (line 262)
* ragged-left:                           Manipulating Filling and Adjusting.
                                                              (line  65)
* ragged-right:                          Manipulating Filling and Adjusting.
                                                              (line  61)
* rc request, and glyph definitions:     Using Symbols.       (line 284)
* read-only register, changing format:   Assigning Formats.   (line  69)
* reading from standard input (rd):      I/O.                 (line  79)
* recursive macros:                      while.               (line  40)
* refer, and macro names starting with [ or ]: Identifiers.   (line  48)
* refer, the program:                    grefer.              (line   6)
* reference, gtroff:                     gtroff Reference.    (line   6)
* references [ms]:                       ms Insertions.       (line   6)
* register, creating alias (aln):        Setting Registers.   (line  79)
* register, format (\g):                 Assigning Formats.   (line  77)
* register, removing (rr):               Setting Registers.   (line  71)
* register, renaming (rnn):              Setting Registers.   (line  75)
* registers:                             Registers.           (line   6)
* registers specific to grohtml:         grohtml specific registers and strings.
                                                              (line   6)
* registers, built-in:                   Built-in Registers.  (line   6)
* registers, interpolating (\n):         Interpolating Registers.
                                                              (line   6)
* registers, setting (nr, \R):           Setting Registers.   (line   6)
* removing diversion (rm):               Strings.             (line 219)
* removing glyph definition (rchar, rfschar): Using Symbols.  (line 341)
* removing macro (rm):                   Strings.             (line 219)
* removing number register (rr):         Setting Registers.   (line  71)
* removing request (rm):                 Strings.             (line 219)
* removing string (rm):                  Strings.             (line 219)
* renaming diversion (rn):               Strings.             (line 216)
* renaming macro (rn):                   Strings.             (line 216)
* renaming number register (rnn):        Setting Registers.   (line  75)
* renaming request (rn):                 Strings.             (line 216)
* renaming string (rn):                  Strings.             (line 216)
* request arguments:                     Request and Macro Arguments.
                                                              (line   6)
* request arguments, and compatibility mode: Gtroff Internals.
                                                              (line  93)
* request, removing (rm):                Strings.             (line 219)
* request, renaming (rn):                Strings.             (line 216)
* request, undefined:                    Comments.            (line  25)
* requests:                              Requests.            (line   6)
* requests for drawing:                  Drawing Requests.    (line   6)
* requests for input and output:         I/O.                 (line   6)
* resolution, device:                    DESC File Format.    (line  11)
* resolution, horizontal:                DESC File Format.    (line  14)
* resolution, horizontal, register (.H): Built-in Registers.  (line  15)
* resolution, vertical:                  DESC File Format.    (line  18)
* resolution, vertical, register (.V):   Built-in Registers.  (line  23)
* returning to marked vertical page location (rt): Page Motions.
                                                              (line  11)
* revision number register (.Y):         Built-in Registers.  (line  93)
* rf, the program:                       History.             (line   6)
* right-justifying (rj):                 Manipulating Filling and Adjusting.
                                                              (line 239)
* rj request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* rn glyph, and cflags:                  Using Symbols.       (line 262)
* roff, the program:                     History.             (line  15)
* roman glyph, correction after italic glyph (\/): Ligatures and Kerning.
                                                              (line  80)
* roman glyph, correction before italic glyph (\,): Ligatures and Kerning.
                                                              (line  92)
* Roman numerals:                        Assigning Formats.   (line  32)
* Roman numerals, maximum and minimum:   Assigning Formats.   (line  60)
* rq glyph, and rq string [man]:         Predefined man strings.
                                                              (line  22)
* rq glyph, at end of sentence <1>:      Using Symbols.       (line 272)
* rq glyph, at end of sentence:          Sentences.           (line  19)
* rt request, using + and -:             Expressions.         (line  57)
* ru glyph, and cflags:                  Using Symbols.       (line 262)
* runoff, the program:                   History.             (line   6)
* s unit <1>:                            Fractional Type Sizes.
                                                              (line   6)
* s unit:                                Measurements.        (line  39)
* safer mode <1>:                        I/O.                 (line  33)
* safer mode <2>:                        Built-in Registers.  (line  18)
* safer mode <3>:                        Macro Directories.   (line  21)
* safer mode:                            Groff Options.       (line 194)
* saving horizontal input line position (\k): Page Motions.   (line 205)
* scaling operator:                      Expressions.         (line  37)
* searching fonts:                       Font Directories.    (line   6)
* searching macro files:                 Macro Directories.   (line  11)
* searching macros:                      Macro Directories.   (line   6)
* seconds, current time (seconds):       Built-in Registers.  (line  26)
* sentence space:                        Sentences.           (line  12)
* sentence space size register (.sss):   Manipulating Filling and Adjusting.
                                                              (line 136)
* sentences:                             Sentences.           (line   6)
* setting diversion trap (dt):           Diversion Traps.     (line   7)
* setting end-of-input trap (em):        End-of-input Traps.  (line   7)
* setting input line number (lf):        Debugging.           (line  10)
* setting input line trap (it):          Input Line Traps.    (line   8)
* setting registers (nr, \R):            Setting Registers.   (line   6)
* shading filled objects (\D'f ...'):    Drawing Requests.    (line 145)
* shc request, and translations:         Character Translations.
                                                              (line 177)
* site-specific directory <1>:           Font Directories.    (line  29)
* site-specific directory:               Macro Directories.   (line  26)
* size of sentence space register (.sss): Manipulating Filling and Adjusting.
                                                              (line 136)
* size of type:                          Sizes.               (line   6)
* size of word space register (.ss):     Manipulating Filling and Adjusting.
                                                              (line 136)
* size, paper:                           Paper Size.          (line   6)
* sizes:                                 Sizes.               (line   6)
* sizes, fractional <1>:                 Implementation Differences.
                                                              (line  76)
* sizes, fractional:                     Fractional Type Sizes.
                                                              (line   6)
* skew, of last glyph (.csk):            Environments.        (line  97)
* slant, font, changing (\S):            Artificial Fonts.    (line  46)
* soelim, the program:                   gsoelim.             (line   6)
* soft hyphen character, setting (shc):  Manipulating Hyphenation.
                                                              (line 240)
* soft hyphen glyph (hy):                Manipulating Hyphenation.
                                                              (line 240)
* solid circle, drawing (\D'C ...'):     Drawing Requests.    (line 118)
* solid ellipse, drawing (\D'E ...'):    Drawing Requests.    (line 128)
* solid polygon, drawing (\D'P ...'):    Drawing Requests.    (line 171)
* sp request, and no-space mode:         Manipulating Spacing.
                                                              (line 115)
* sp request, and traps:                 Manipulating Spacing.
                                                              (line  39)
* sp request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* space between sentences:               Sentences.           (line  12)
* space between sentences register (.sss): Manipulating Filling and Adjusting.
                                                              (line 136)
* space between words register (.ss):    Manipulating Filling and Adjusting.
                                                              (line 136)
* space character:                       Escapes.             (line  72)
* space character, zero width (\&) <1>:  Drawing Requests.    (line  32)
* space character, zero width (\&) <2>:  Ligatures and Kerning.
                                                              (line  47)
* space character, zero width (\&):      Requests.            (line  49)
* space characters, in expressions:      Expressions.         (line  68)
* space, discardable, horizontal:        Manipulating Filling and Adjusting.
                                                              (line 167)
* space, discarded, in traps:            Manipulating Spacing.
                                                              (line  39)
* space, horizontal (\h):                Page Motions.        (line 112)
* space, horizontal, unformatting:       Strings.             (line 150)
* space, unbreakable:                    Page Motions.        (line 123)
* space, vertical, unit (v):             Measurements.        (line  57)
* space, width of a digit (\0):          Page Motions.        (line 139)
* spaces with ds:                        Strings.             (line  56)
* spaces, in a macro argument:           Request and Macro Arguments.
                                                              (line  10)
* spaces, leading and trailing:          Filling and Adjusting.
                                                              (line  10)
* spacing:                               Basics.              (line  85)
* spacing, manipulating:                 Manipulating Spacing.
                                                              (line   6)
* spacing, vertical:                     Sizes.               (line   6)
* special characters <1>:                Special Characters.  (line   6)
* special characters:                    Character Translations.
                                                              (line 164)
* special characters [ms]:               ms Strings and Special Characters.
                                                              (line   6)
* special fonts <1>:                     Font File Format.    (line  28)
* special fonts <2>:                     Special Fonts.       (line   6)
* special fonts:                         Using Symbols.       (line  15)
* special fonts, emboldening:            Artificial Fonts.    (line 116)
* special request, and font translations: Changing Fonts.     (line  53)
* special request, and glyph search order: Using Symbols.     (line  15)
* spline, drawing (\D'~ ...'):           Drawing Requests.    (line 140)
* springing a trap:                      Traps.               (line  11)
* sqrtex glyph, and cflags:              Using Symbols.       (line 262)
* stacking glyphs (\b):                  Drawing Requests.    (line 223)
* standard input, reading from (rd):     I/O.                 (line  79)
* stderr, printing to (tm, tm1, tmc):    Debugging.           (line  27)
* stops, tabulator:                      Tab Stops.           (line   6)
* string arguments:                      Strings.             (line  15)
* string expansion (\*):                 Strings.             (line  15)
* string interpolation (\*):             Strings.             (line  15)
* string, appending (as):                Strings.             (line 171)
* string, creating alias (als):          Strings.             (line 224)
* string, length of (length):            Strings.             (line 204)
* string, removing (rm):                 Strings.             (line 219)
* string, renaming (rn):                 Strings.             (line 216)
* strings:                               Strings.             (line   6)
* strings [ms]:                          ms Strings and Special Characters.
                                                              (line   6)
* strings specific to grohtml:           grohtml specific registers and strings.
                                                              (line   6)
* strings, multi-line:                   Strings.             (line  63)
* strings, shared name space with macros and diversions: Strings.
                                                              (line  94)
* stripping final newline in diversions: Strings.             (line 150)
* structuring source code of documents or macro packages: Requests.
                                                              (line  14)
* sty request, and changing fonts:       Changing Fonts.      (line  11)
* sty request, and font positions:       Font Positions.      (line  61)
* sty request, and font translations:    Changing Fonts.      (line  53)
* styles, font:                          Font Families.       (line   6)
* substring (substring):                 Strings.             (line 188)
* suppressing output (\O):               Suppressing output.  (line   7)
* sv request, and no-space mode:         Page Control.        (line  64)
* switching environments (ev):           Environments.        (line  39)
* sy request, and safer mode:            Groff Options.       (line 194)
* symbol:                                Using Symbols.       (line  15)
* symbol table, dumping (pm):            Debugging.           (line  64)
* symbol, defining (char):               Using Symbols.       (line 284)
* symbols, using:                        Using Symbols.       (line   6)
* system() return value register (systat): I/O.               (line 194)
* tab character <1>:                     Escapes.             (line  72)
* tab character:                         Tab Stops.           (line   6)
* tab character, and translations:       Character Translations.
                                                              (line 173)
* tab character, non-interpreted (\t):   Tabs and Fields.     (line  10)
* tab repetition character (tc):         Tabs and Fields.     (line 139)
* tab settings register (.tabs):         Tabs and Fields.     (line 126)
* tab stops:                             Tab Stops.           (line   6)
* tab stops [man]:                       Miscellaneous man macros.
                                                              (line  10)
* tab stops, for TTY output devices:     Tabs and Fields.     (line 124)
* tab, line-tabs mode:                   Tabs and Fields.     (line 148)
* table of contents <1>:                 Leaders.             (line  30)
* table of contents:                     Table of Contents.   (line   6)
* table of contents, creating [ms]:      ms TOC.              (line   6)
* tables [ms]:                           ms Insertions.       (line   6)
* tabs, and fields:                      Tabs and Fields.     (line   6)
* tabs, before comments:                 Comments.            (line  21)
* tbl, the program:                      gtbl.                (line   6)
* text line, position of lowest (.h):    Diversions.          (line  69)
* text, gtroff processing:               Text.                (line   6)
* text, justifying:                      Manipulating Filling and Adjusting.
                                                              (line   6)
* text, justifying (rj):                 Manipulating Filling and Adjusting.
                                                              (line 239)
* thickness of lines (\D't ...'):        Drawing Requests.    (line 196)
* three-part title (tl):                 Page Layout.         (line  35)
* ti request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* ti request, using + and -:             Expressions.         (line  57)
* time, current:                         I/O.                 (line 171)
* time, current, hours (hours):          Built-in Registers.  (line  35)
* time, current, minutes (minutes):      Built-in Registers.  (line  31)
* time, current, seconds (seconds):      Built-in Registers.  (line  26)
* title line (tl):                       Page Layout.         (line  35)
* title line length register (.lt):      Page Layout.         (line  63)
* title line, length (lt):               Page Layout.         (line  63)
* title page, example markup:            ms Cover Page Macros.
                                                              (line  67)
* titles:                                Page Layout.         (line  31)
* tkf request, and font styles:          Font Families.       (line  61)
* tkf request, and font translations:    Changing Fonts.      (line  53)
* tkf request, with fractional type sizes: Fractional Type Sizes.
                                                              (line   6)
* tl request, and mc:                    Miscellaneous.       (line 105)
* tmac, directory:                       Macro Directories.   (line  11)
* tmac, path:                            Macro Directories.   (line  11)
* TMPDIR, environment variable:          Environment.         (line  37)
* token, input:                          Gtroff Internals.    (line   6)
* top margin:                            Page Layout.         (line  20)
* top-level diversion:                   Diversions.          (line  12)
* top-level diversion, and \!:           Diversions.          (line 171)
* top-level diversion, and \?:           Diversions.          (line 176)
* top-level diversion, and bp:           Page Control.        (line  25)
* tr request, and glyph definitions:     Using Symbols.       (line 284)
* tr request, and soft hyphen character: Manipulating Hyphenation.
                                                              (line 240)
* tr request, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line  86)
* track kerning:                         Ligatures and Kerning.
                                                              (line  53)
* track kerning, activating (tkf):       Ligatures and Kerning.
                                                              (line  60)
* trailing quotes:                       Strings.             (line  56)
* trailing spaces:                       Filling and Adjusting.
                                                              (line  10)
* translations of characters:            Character Translations.
                                                              (line   6)
* transparent characters <1>:            Using Symbols.       (line 272)
* transparent characters:                Sentences.           (line  19)
* transparent output (\!, \?):           Diversions.          (line 134)
* transparent output (cf, trf):          I/O.                 (line  49)
* transparent output, incompatibilities with AT&T troff: Implementation Differences.
                                                              (line 107)
* trap, changing location (ch):          Page Location Traps. (line 106)
* trap, distance, register (.t):         Page Location Traps. (line  97)
* trap, diversion, setting (dt):         Diversion Traps.     (line   7)
* trap, end-of-input, setting (em):      End-of-input Traps.  (line   7)
* trap, input line, setting (it):        Input Line Traps.    (line   8)
* trap, planting:                        Traps.               (line  11)
* trap, springing:                       Traps.               (line  11)
* traps:                                 Traps.               (line   6)
* traps, and discarded space:            Manipulating Spacing.
                                                              (line  39)
* traps, and diversions:                 Page Location Traps. (line 163)
* traps, blank line:                     Blank Line Traps.    (line   6)
* traps, diversion:                      Diversion Traps.     (line   6)
* traps, dumping (ptr):                  Debugging.           (line  79)
* traps, end-of-input:                   End-of-input Traps.  (line   6)
* traps, input line:                     Input Line Traps.    (line   6)
* traps, input line, and interrupted lines (itc): Input Line Traps.
                                                              (line  25)
* traps, page location:                  Page Location Traps. (line   6)
* traps, sprung by bp request (.pe):     Page Location Traps. (line 139)
* trf request, and invalid characters:   I/O.                 (line  67)
* trf request, causing implicit linebreak: Manipulating Filling and Adjusting.
                                                              (line   6)
* trin request, and asciify:             Diversions.          (line 195)
* troff mode:                            Troff and Nroff Mode.
                                                              (line   6)
* troff output:                          gtroff Output.       (line  16)
* truncated vertical space register (.trunc): Page Location Traps.
                                                              (line 127)
* tutorial for macro users:              Tutorial for Macro Users.
                                                              (line   6)
* type size:                             Sizes.               (line   6)
* type size registers (.s, .ps):         Changing Type Sizes. (line  19)
* type sizes, changing (ps, \s):         Changing Type Sizes. (line  11)
* type sizes, fractional <1>:            Implementation Differences.
                                                              (line  76)
* type sizes, fractional:                Fractional Type Sizes.
                                                              (line   6)
* u unit:                                Measurements.        (line   6)
* uf request, and font styles:           Font Families.       (line  61)
* ul glyph, and cflags:                  Using Symbols.       (line 262)
* ul request, and font translations:     Changing Fonts.      (line  53)
* Ultrix-specific man macros:            Optional man extensions.
                                                              (line  30)
* unary operators:                       Expressions.         (line  21)
* unbreakable space:                     Page Motions.        (line 123)
* undefined identifiers:                 Identifiers.         (line  81)
* undefined request:                     Comments.            (line  25)
* underline font (uf):                   Artificial Fonts.    (line  91)
* underlining (ul):                      Artificial Fonts.    (line  65)
* underlining, continuous (cu):          Artificial Fonts.    (line  87)
* underscore glyph (\[ru]):              Drawing Requests.    (line  28)
* unformatting diversions (asciify):     Diversions.          (line 195)
* unformatting horizontal space:         Strings.             (line 150)
* Unicode <1>:                           Using Symbols.       (line 207)
* Unicode:                               Identifiers.         (line  15)
* unit, c:                               Measurements.        (line  27)
* unit, f:                               Measurements.        (line  42)
* unit, f, and colors:                   Colors.              (line  35)
* unit, i:                               Measurements.        (line  22)
* unit, M:                               Measurements.        (line  61)
* unit, m:                               Measurements.        (line  49)
* unit, n:                               Measurements.        (line  54)
* unit, P:                               Measurements.        (line  34)
* unit, p:                               Measurements.        (line  30)
* unit, s <1>:                           Fractional Type Sizes.
                                                              (line   6)
* unit, s:                               Measurements.        (line  39)
* unit, u:                               Measurements.        (line   6)
* unit, v:                               Measurements.        (line  57)
* unit, z <1>:                           Fractional Type Sizes.
                                                              (line   6)
* unit, z:                               Measurements.        (line  39)
* units of measurement:                  Measurements.        (line   6)
* units, default:                        Default Units.       (line   6)
* unnamed fill colors (\D'F...'):        Drawing Requests.    (line 206)
* unnamed glyphs:                        Using Symbols.       (line 218)
* unnamed glyphs, accessing with \N:     Font File Format.    (line  51)
* unsafe mode <1>:                       I/O.                 (line  33)
* unsafe mode <2>:                       Built-in Registers.  (line  18)
* unsafe mode <3>:                       Macro Directories.   (line  21)
* unsafe mode:                           Groff Options.       (line 199)
* user's macro tutorial:                 Tutorial for Macro Users.
                                                              (line   6)
* user's tutorial for macros:            Tutorial for Macro Users.
                                                              (line   6)
* using symbols:                         Using Symbols.       (line   6)
* utf-8, output encoding:                Groff Options.       (line 150)
* v unit:                                Measurements.        (line  57)
* valid numeric expression:              Expressions.         (line  65)
* value, incrementing without changing the register: Auto-increment.
                                                              (line  53)
* variables in environment:              Environment.         (line   6)
* version number, major, register (.x):  Built-in Registers.  (line  85)
* version number, minor, register (.y):  Built-in Registers.  (line  89)
* vertical line drawing (\L):            Drawing Requests.    (line  51)
* vertical line spacing register (.v):   Changing Type Sizes. (line  87)
* vertical line spacing, changing (vs):  Changing Type Sizes. (line  87)
* vertical line spacing, effective value: Changing Type Sizes.
                                                              (line 105)
* vertical motion (\v):                  Page Motions.        (line  87)
* vertical page location, marking (mk):  Page Motions.        (line  11)
* vertical page location, returning to marked (rt): Page Motions.
                                                              (line  11)
* vertical position in diversion register (.d): Diversions.   (line  62)
* vertical position trap enable register (.vpt): Page Location Traps.
                                                              (line  18)
* vertical position traps, enabling (vpt): Page Location Traps.
                                                              (line  18)
* vertical position, current (nl):       Page Control.        (line  68)
* vertical resolution:                   DESC File Format.    (line  18)
* vertical resolution register (.V):     Built-in Registers.  (line  23)
* vertical space unit (v):               Measurements.        (line  57)
* vertical spacing:                      Sizes.               (line   6)
* warnings <1>:                          Warnings.            (line   6)
* warnings:                              Debugging.           (line 149)
* warnings, level (warn):                Debugging.           (line 155)
* what is groff?:                        What Is groff?.      (line   6)
* while:                                 while.               (line   6)
* while request, and font translations:  Changing Fonts.      (line  53)
* while request, and the ! operator:     Expressions.         (line  21)
* while request, confusing with br:      while.               (line  73)
* while request, operators to use with:  Operators in Conditionals.
                                                              (line   6)
* whitespace characters:                 Identifiers.         (line  10)
* width escape (\w):                     Page Motions.        (line 154)
* width, of last glyph (.w):             Environments.        (line  97)
* word space size register (.ss):        Manipulating Filling and Adjusting.
                                                              (line 136)
* writing macros:                        Writing Macros.      (line   6)
* writing to file (write):               I/O.                 (line 211)
* year, current, register (year, yr):    Built-in Registers.  (line  48)
* z unit <1>:                            Fractional Type Sizes.
                                                              (line   6)
* z unit:                                Measurements.        (line  39)
* zero width space character (\&) <1>:   Drawing Requests.    (line  32)
* zero width space character (\&) <2>:   Ligatures and Kerning.
                                                              (line  47)
* zero width space character (\&):       Requests.            (line  49)
* zero-width printing (\z, \Z):          Page Motions.        (line 222)
* |, and page motion:                    Expressions.         (line  52)




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