Simple application to get window WId ?

[Aaron Lewis]

Hi,
	I'm currently working on a KDE application , plasma-globalmenu , which
will make all GTK / Gnome application globally on XBar , but now i'm
meeting a problem , so i need to write a simply application , which
could help me detect the WId of a running window.

Like , popup a mouse , let me click on something , and print a unique
number (WId) , in decimal or hex , doesn't matter.

Could anyone give a hand on this simple application ?

I think it's very basic , but i've never done pure X11 programming
before , any guides is appreciated.

Many thanks !

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Best Regards,
Aaron Lewis - PGP: 0x4A6D32A0
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