chor'> &para;</a></span></dt>
<dd><p>The &rsquo;loop&rsquo; (event loop) argument is optional.  This procedure will
remove a read watch from the event loop passed in as an argument, or
if none is passed (or #f is passed), from the default event loop.  The
file argument may be a port or a file descriptor.  This is thread safe
- any thread may remove a watch.  A file descriptor and a port with
the same underlying file descriptor compare equal for the purposes of
removal.
</p>
<p>This procedure should not thro