Reading Graphics Frame buffer

Hello Everyone,
I want to write pixels to my graphics card frame buffer using application A and read the frame buffer using application B.

Application A has a window and I have no problem drawing to the window/frame buffer.

I want Application B to read the frame buffer without having any window. I want to use this technique to monitor a scene from application A.

Can I do this? I don’t have application B written because I don’t know how to read the buffer without having a window.

Isn’t the frame buffer and the window different? I thought the window is a subset of the frame buffer. When I define my graphics card output as 1600x1200, isn’t that my frame buffer size?


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