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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: file variables and man pages with preprocessors
Date: Thu, 08 Nov 2007 12:39:54 -0500
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    Well, preconv acts as a filter -- as do (almost) all components in
    groff -- thus reading something from the `end of a file' (a) needs a
    temporary buffer since the input data stream is `stdin' in most cases
    and (b) isn't implemented in preconv due to (a).

I don't understand this.  What is preconv, and what does it have to do
with visiting these files in Emacs?