does nothing if its <I>proc</I> and
<I>clientData</I> arguments do not match the <I>proc</I> and <I>clientData</I>
for a  close handler for <I>channel</I>.
<H3><A NAME="M6">SEE ALSO</A></H3>
<B><A HREF="../TclCmd/close.html">close</A></B>, <B><A HREF="OpenFileChnl.html">Tcl_Close</A></B>, <B><A HREF="OpenFileChnl.html">Tcl_UnregisterChannel</A></B>
<H3><A NAME="M7">KEYWORDS</A></H3>
<A href="../Keywords/C.html#callback">callback</A>, <A href="../Keywords/C.html#channel closing">channel closing</A>
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