Ben,

Look for Binding to Windows Message events -> Application Activation in VFP9 Solution samples.

BINDEVENT(_VFP.hWnd, WM_ACTIVATE, THIS, "handlewinmsg" )

>When I switch to other applications from my VFP application, I want to do something in the VFP application. I believe BindEvent() can let VFP know the user is switching away. Which Windows message should I bind to?