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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.


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