identifying owning process

"Ian Archer" <[email protected]> Mon, 4 Jun 2007 16:00:56 -0700

Newsgroups	gmane.comp.xfree86.devel
Message-ID	<[email protected]>

Is there any way to identify the application which "owns" an x-window?
 I'd like to be able to figure out, for example, that gimp owns window
'X'.

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