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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: region-active-p
Date: Tue, 23 Oct 2007 03:12:20 -0400
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    (defun region-active-p ()
      "..."
      (and zmacs-regions zmacs-region-extent
	   (eq (current-buffer) (zmacs-region-buffer))))

When commands in XEmacs call this, do they also test
for a nonempty region?  Or do they operate on the region
when it is empty?

I don't see any need for region-exists-p
unless we want it specifically to run code in Emacs
which was written for XEmacs.