finally, it does not always return false, but I can't understand when and
why it returns true or false... By drawing something in the device (hWnd) or
by displaying a Messagebox before calling IsWindowVisible(hWnd), I managed
to make it return true, but then again, it's not everytime...  Sometimes it
should return true and it returns false... I'm pretty sure it's not a bug,
so there must be something I don't get...  must I put a "DoEvents" (does it
exist in c#?) before my call? Must I monitor for the first time it's visible
and then close when it not visible anymore after that? It would seem weird
to me to wait for something to become visible when this is the very same
thing that called you in the first place...

thanks

ThunderMusic