bug#3599: 23.0.94; (elisp)Window Tree: Need to define root window

"Drew Adams" <[email protected]>
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]> 
"where ROOT represents the window tree of the frame's root window"
 
So what is the "frame's root window" - what does that mean?
 
Note too that "root window" means something about window manager
windows, outside Emacs, so it is all the more important to explain
this concept.
 

In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600)
 of 2009-05-24 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'
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