It was a guy from the directx team talking about buffercount <> fullscreen/windowed <> blt/flip, sketching stuff on a whiteboard. Should have bookmarked it then, now I can't find it anymore.

thanks in advance

By chance I can across this topic www.gamedev.net/topic/625120-setting-fullscreen-exclusive-mode/
I'm not sure whether this is what you are looking for, but I hope it'll help

Necro. Locking.