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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: url-dired.el requires w3
Date: Wed, 21 Nov 2007 21:26:57 -0500
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To: Diane Murray <disumu@x3y2z1.net>
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What happens with your change if the user has installed w3 but it is
not loaded into Emacs?

Would it be correct to use browse-url rather than w3?
browse-url is always included in Emacs.