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`@syncodeindex'
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   When you want to combine functions and concepts into one index, you
should index the functions with `@findex' and index the concepts with
`@cindex', and use the `@syncodeindex' command to redirect the function
index entries into the concept index.

   The `@syncodeindex' command takes two arguments; they are the name
of the index to redirect, and the name of the index to redirect it to.
The template looks like this:

     @syncodeindex FROM TO

   For this purpose, the indices are given two-letter names:

`cp'
     concept index

`fn'
     function index

`vr'
     variable index

`ky'
     key index

`pg'
     program index

`tp'
     data type index

   Write an `@syncodeindex' command before or shortly after the
end-of-header line at the beginning of a Texinfo file.  For example, to
merge a function index with a concept index, write the following:

     @syncodeindex fn cp

This will cause all entries designated for the function index to merge
in with the concept index instead.

   To merge both a variables index and a function index into a concept
index, write the following:

     @syncodeindex vr cp
     @syncodeindex fn cp

   The `@syncodeindex' command puts all the entries from the `from'
index (the redirected index) into the `@code' font, overriding whatever
default font is used by the index to which the entries are now
directed.  This way, if you direct function names from a function index
into a concept index, all the function names are printed in the `@code'
font as you would expect.