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(texinfo)Predefined Indices

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Predefined Indices
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  Texinfo provides six predefined indices:

   * A "concept index" listing concepts that are discussed.

   * A "function index" listing functions (such as entry points of
     libraries).

   * A "variables index" listing variables (such as global variables of
     libraries).

   * A "keystroke index" listing keyboard commands.

   * A "program index" listing names of programs.

   * A "data type index" listing data types (such as structures defined
     in header files).

Not every manual needs all of these, and most manuals use two or three
of them.  This manual has two indices: a concept index and an @-command
index (that is actually the function index but is called a command
index in the chapter heading).  Two or more indices can be combined
into one using the `@synindex' or `@syncodeindex' commands.  Note:
Combining Indices.