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Re: region-active-p

From: Richard Stallman
Subject: Re: region-active-p
Date: Tue, 23 Oct 2007 13:53:40 -0400 
    > 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?

    No.

What does "no" mean in this context?  (Please don't ask which part of
"no" I don't understand.)

        AFAIU `zmacs-region-extent' checks for a physical extend, it may be nil 
or 
    have a value, for example I got

What does "checks for a physical extend" mean?
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