Application for finding all Windows

[Udayan Singh <udayan singh tcs com>]

Hi, 

I want to develop an application where I can get a list of all the windows
that are open in the GNOME Screen and find any activity being performed
on any other window on the GUI screen (and not only my application) e.g.
mouse click on window of another application sends me a signal.

Plan to use GNOME as environment. Can I use Metacity (for GNOME) here to
capture a mouse click occuring on any other application (i.e. any other
application and not made /implemented by me) ? 

Any pointers of how I can go about doing the same ??

tia.. 
us
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