Documentation: best source?

[Kaveh Bazargan]

I am having difficulty finding what I want in the documentation. I have a
hard copy of Dan Shafer's book, but that is not comprehensive enough
without the future volumes. I find with the help menu I go round and round
in circles. I can see lots of tips but I can't get to what I want.

For example I am creating an options button and I need to know how to get
the item selected. Where is the best place to look for that?
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Kaveh Bazargan
http://www.focalimage.com/
http://www.holographer.org/