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(texinfo)Useful Highlighting

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Highlighting Commands are Useful
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  The highlighting commands can be used to extract useful information
from the file, such as lists of functions or file names.  It is
possible, for example, to write a program in Emacs Lisp (or a keyboard
macro) to insert an index entry after every paragraph that contains
words or phrases marked by a specified command.  You could do this to
construct an index of functions if you had not already made the entries.

  The commands serve a variety of purposes:

`@code{SAMPLE-CODE}'
     Indicate text that is a literal example of a piece of a program.

`@kbd{KEYBOARD-CHARACTERS}'
     Indicate keyboard input.

`@key{KEY-NAME}'
     Indicate the conventional name for a key on a keyboard.

`@samp{TEXT}'
     Indicate text that is a literal example of a sequence of
     characters.

`@var{METASYNTACTIC-VARIABLE}'
     Indicate a metasyntactic variable.

`@env{ENVIRONMENT-VARIABLE}'
     Indicate an environment variable.

`@file{FILE-NAME}'
     Indicate the name of a file.

`@command{COMMAND-NAME}'
     Indicate the name of a command.

`@option{OPTION}'
     Indicate a command-line option.

`@dfn{TERM}'
     Indicate the introductory or defining use of a term.

`@cite{REFERENCE}'
     Indicate the name of a book.

`@acronym{ACRONYM}'
     Indicate an acronym.

`@url{UNIFORM-RESOURCE-LOCATOR}'
     Indicate a uniform resource locator for the World Wide Web.

`@email{EMAIL-ADDRESS[, DISPLAYED-TEXT]}'
     Indicate an electronic mail address.