Developing an app to controll multiple screens at once

From: Daniel (dhoult_at_landair.com)
Date: 12/31/03 

Date: 31 Dec 2003 07:49:02 -0800

He's my situation, i work in a (big)room that has 3 projectors. I want
to develop an application that can control all 3 screens displaying
different live data, from a computer that has a video card for each
projecttor.
Where in the world do i start looking for information on how this can
be accomplished? platform does not matter. Win32 or linux (preferably
linux though)

any help would be appreciated.