How to use the help system in GTK?

[Jacques Pelletier <jpelletier ieee org>]

Hi all,

I want to make some context sensitive help documentation for my application.
On clicking the help buttons, depending on the context, appropriate help will 
be displayed.

In windows, there are compiled help files that can be loaded for providing 
online help.

Is there something similar on linux? 
Does the GTK have something to display some formatted help? 
Is there some kind of editor for help files?
Is there some standard or preferred format?


Thanks!

JP