Minimizing full screen game

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CGV

I've been trying to minimize a full screen game by calling ShowWindow(hwnd, SW_MINIMIZE) but the app doesn't minimize it just disappears. I also tried it using SetWindowPlacement and got the same result.

I have to then hit Ctrl-Alt-Del and terminate the app from there.

Is it not possible to programmically minimize a Blitz app?
I've done it in my C directX games so I know these functions work.