Christof-
If one is using a top-level form, couldn't that be useful?
Or, perhaps, in the base form class deactivate and activate could send a message to the app object that it's being deactivated or activated. If the form being activated is the same as the form being deactivated then a fair bet (but not foolproof) would be that another application had focus.

Thoughts?

>The activate event of the _SCREEN. But you can't capture it in VFP. If you know C++, you could write a DLL that hooks into the event queue and react accordingly, but with native VFP code I think that's impossible.