Changes on The Screen

Hey experts

I am making a program that monitors a screen on another computer on the network.

I need to see which pixels have changed and send it back. But i dont want to use a timer or anything of that sort to check the screen every second or so because it takes up alot of resources.
I am looking an ez solution to this problem
So i would like to know if it is possible to let my program to receive a message when a pixel has changed on the screen.

Thank You,
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You need to hook some Windows messages.
Look at VNC source code how to do that.

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Can we see a Delphi solution ? I can offer 500 points for this.
I'm rather busy now. But I'll try to find a couple of hours on the weekend.
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