how to set exclusive fullscreen mode,just as what DX does? the gdi''s desktop and my opengl window costs twice of the video memory what a fullscreen mode requires. that makes my program run poorly on cards of small video momery, because opengl32.dll switch to software emulation mode when there''s not enough video memory.

Create a window that is always on top. I do not remember the exact name of the flag but you can look in the NeHe tutorials.