Terminating a program

I have divided my system to a launcher program and the actual (full 
screen) graphics application.

In some cases the laucher needs to terminate the graphics application.

I have been trying
       SendMessageTimeout(hwnd,WM_CLOSE,0,0,
			 SMTO_NORMAL,
			 10000,
			 &res);

and

           PostMessage(hwnd, WM_CLOSE, 0, 0) ;


but neither of these is fully reliable. In some cases
I get the Windows "End Program" dialogue on screen asking
the user if the program should really be terminated.

That is not ok for me.

Actually I don't really care if the program gets its chance of
getting cleanly shut down, but it is very much necessary that the
OpenGL (Nvidia) and sound drivers (Creative) are not left in a
corrupt state. And Windows (XP) itself must be able to get
all resources back etc.

Any ideas how to do this?

		Eero




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