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13.4 Combining Indices
======================

Sometimes you will want to combine two disparate indices such as
functions and concepts, perhaps because you have few enough entries that
a separate index would look silly.

  You could put functions into the concept index by writing '@cindex'
commands for them instead of '@findex' commands, and produce a
consistent manual by printing the concept index with the title 'Function
and Concept Index' and not printing the 'Function Index' at all; but
this is not a robust procedure.  It works only if your document is never
included as part of another document that is designed to have a separate
function index; if your document were to be included with such a
document, the functions from your document and those from the other
would not end up together.  Also, to make your function names appear in
the right font in the concept index, you would need to enclose every one
of them between the braces of '@code'.

@syncodeindex

How to merge two indices, using '@code' font for the merged-from index.

@synindex

How to merge two indices, using the roman font for the merged-from index.