Application specific desktop geometry

How can I given different applications different desktop geometries. I 
have a kiosk application that uses the right 1/4 of the screen for 
status information. I don't want the user to be able to move 
applications like vlc and flash windows into the right 1/4 of the screen 
even if they run in full screen mode. How can I restrict certain 
applications to only render in the left 3/4 of the screen. I don't want 
to have to start another X server for them because I will lose hardware 
acceleration.

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