Ada help file indexed by keyword

[Manuel Collado <m.collado@invalid.domain>]

I'm looking for an Ada95/2005 help or reference document indexed by 
keyword (reserved word or standard library identifier).

The purpose is to integrate it into an academic IDE, so it should be 
possible to put the cursor in the editing window over a meaningful word, 
and invoke help about it.

So far I've found the ARM in several formats, but none of them can be 
accessed as described. There is also the Ada wikibook, that also lacks 
the required feature. Even GNAT/GPS seems to lack it.

Any common hiperlinked format is acceptable: WinHelp, HTML (local or 
www), PDF, TexInfo, etc..

Does anybody knows if there exist such help system for Ada?

Thanks in advance.
-- 
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado