any documentation for Gtk-- ?

[mwkohout csbsju edu]

I was wondering-does anyone know where some extensive documentation of
Gtk-- is?  I've been reading the list for the last few weeks, and I've
also been crusing the net looking for some info, but I haven't found
anything yet...does Havoc Pennington's book cover it at all?

I read the documentation on Gtk--'s home page, but it was a little
sparse.

thanks for any info,
mike kohout