Italic is used for:
UNIX pathnames, filenames, program names, user command names, and options for user commands.
New terms where they are defined.
Typewriter Font is used for:
Anything that would be typed verbatim into code, such as examples of source code and text on the screen.
The contents of include files, such as structure types, structure members, symbols (defined constants and bit flags), and macros.
Xlib functions.
Names of subroutines of the example programs.
Italic Typewriter Font is used
for:
Arguments to Xlib functions, since they could be typed in code as shown but are arbitrary.
Helvetica Italics are used for:
Titles of examples, figures, and tables.
Boldface is used for:
Chapter and section headings.
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