How can I get WM_ACTIVATEAPP message for an form based application

I must do something when the application is activated,
but how can I get the message?
Or to say, how can I know when the application is activated,  either by keyboard(Alt+Tab) or by mouse click
lorryAsked:
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vorlonCommented:
Lorry,
The Form's activate event is the equivalent of the WM_ACTIVATEAPP from the Windows API. Any processing you want to do when form is activated, place it there. For example the following procedure beeps when it is activated:

Sub Form_Activate()
   Beep
End Sub
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Visual Basic Classic

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