How to get the currently active window on desktop

"Xiaolei Hu" <[email protected]>
Newsgroups gmane.comp.xfree86.devel
Message-ID <[email protected]> 
Hi all,

I refered to the link below describing how to get the windows on X using
XQueryTree, but still i am not clear about how to get the currently active
one. Is there anybody could answer my question? that could be a gread help
for a new-bee.

http://www.mail-archive.com/[email protected]/msg07431.html

Thanks so much,
Aurora
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