Need help with drawing layers design

I am developing an app for annotation of a display. I want it to work like this:
On a window will be displayed some application (e.g. a browser)
The same window is overlayed with a transparent drawing layer.
  The user will be able to draw on the drawing layer to "annotate"
  the underlying application.
I would like to send the whole image (both layers) to a second display
  using Gtk2::Gdk::Display, presumably

I know how to do the drawing in step 2. I think I can use one pixmap on two displays to handle the copying of the annotations. I do not know how to put a live application behind it and to display both layers on the second display. Does anyone have any pointers?

John McDermott, CPLP, CCP
Writer, Educator, Consultant
jjm at
V: +1 505/377-6293  F: +1 505/377-6313

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