>An example would be a prg which determines what to do based on the value of _Screen.activeform.name. Or perhaps a parent class with buttons may determine which buttons to enable based on the value. (Disable the buttons when the form is not active).
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That exactly what I've done in my taskbar class, using binding to windows events.
You can download it from here:

http://dorinvas.googlepages.com/

HTH