how to 'put' render of openGL out with a card?

i have a hardware,which can put a RGBA (0x FF FF FF FF)format memory buff out in a const freq (PAL/NTSC),
i hope openGL can render into that memory buff,so i can show some animation (or something else) with the card,but the question is how can i make openGL render to a RGBA buff not to computer screen?

show some example code please or just tell me some related function by openGL.

thanks a lot.

Have a peek here:

If your opengl hardware and driver isn’t to old you should be able to use pbuffers.