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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: replace.el changes...
Date: Thu, 24 Jun 2004 19:48:13 -0400
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    > Could you please be more explicit?  What is "the history" that you
    > refer to?  Does it have a name?

    `stack'.  It contains point and match-data for previous replacements
    that did not yet happen (and for those that did happen, just t
    instead of the match data).  You can revisit previous replacements by
    using ^.

That is internal data; you can change it however you like.