If <a href="resources/lockmethod.html">LOCKMETHOD</a>
is set to <tt>flock</tt>, then the lock file should never be
manually deleted.  When MHonArc abnormally terminates, then the
lock will be automatically released when the <tt>flock</tt> method
is used.  A stale lock can still occur under the <tt>flock</tt>
method if for some reason a MHonArc
process hangs.  In this case, just kill the offending process and
the lock will automatically be released.
</p>
</td>
</tr>
</table>

<h4>ERROR: Unable to open <var>f