MAV on Ctrl+Alt+Del

Blitz3D Forums/Blitz3D Bug Reports/MAV on Ctrl+Alt+Del

I've already fixed(partialy) bugs with Alt+Tab and other focus loosing.

But press, for exaple, Win+L. Or disable welcome screen(Start -> Control panel -> User account -> Change the way users log on or log off -> (disable) Use the welcome screen) and press Ctrl+Alt+Del to lock work station. Then come back to game.

Have you fixed this bugs? How do you checking for Ctr+Alt+Del or Win+L?
I've tried checking windows messages(7 and 8), GetActiveWindow, TestCooperativeLevel on Blitz3D's DirectDraw object. This hels to figure out usual Alt+Tab and Ctrl+Shift+Esc or Win+D or Ctrl+Alt+Del with enabled welcome screen(so its the same as Ctrl+Shift+Esc-task manager launching instead of locking computer). But nothing let me figure out when user blocks his computer(TestCooperativeLevel seems to work correctly with windowed mode, but not in fullscreen).