Sorry by the delay:
Making a Test I discover than you can do with this:
_Screen.WindowState = 2
_Screen.Alwaysontop = .T.
You can Press Alt+Tab but don't show the window, you can start other programs but don't show its window
I hope this help!
Mauricio
Be fast like the Fox
Be free like the Penguin
Se Rápido como el Zorro
Se libre como el Pingüino