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Highlighting Commands are Useful
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   The highlighting commands can be used to generate 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.

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

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

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