Projector display different bitmap

See more:

C++/CLI

Hello everybody. I am creating simple application for altering image projected by projector.
Now what I want to achieve is for projected image to be different than desktop.
Consider simple example. My application would take a print-screen and add some bitmap to it. Than it will sent it to projector. While original image on notebook monitor is still the same projected image will contain this added bitmap. I am using GDI for altering image and c++/cli , windows forms as a base for my app.
Hope it is understandable and more importantly, that you guys know a way to solve this task.
Thanks in advance.


Well, at least I figured out a "dirty" way to do this. Just using form without borders and extended second display. No tested it yet but i have a strong feeling that it should do the trick. However correct way to do this is still desired very much



Edit: Bringing text of OP from answer to here