Alpha blending in Gtk

[Dinesh Nadarajah <dinesh_list sbcglobal net>]

Hi All:

I guess this question comes up often but I could not find any such of
the mailing list. Does Gtk currently support Alpha blending? I am not
talking of shape masking for transparency but true alpha rendering. 

What are the current developer's thniking on how best to achieve this
in Gtk? A rough outline of the process to follow.

Thanks.

-D