Is there a "correct" Gtk way to...

[beach ataman com]

Does anyone know the right way to do the following using Gdk/Gtk:

1) Determine the size of the display screen

2) Control the selection of the X-Clipboard I have something which
is not a GtkEditable that needs to export a selection).

Thanks for any help.

-- 
David J. C. Beach <beach@ataman.com>
Ataman Software, Inc.