how to floating popup windows in default created workplace?

"Jeff Zhang" <[email protected]>
Newsgroups gmane.comp.window-managers.ion.general
Message-ID <[email protected]> 
Is it possible to make new popup windows floating in default created
workplace?
I'm working in rxvt and will be forced change into another new frame created
by popup message from apps in other workplaces, like workrave created hint
window and download process window of seamonkey.

Thanks in advance!
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