uested. This method must
 be used after <code>nextSolution()</code> returns <code>null</code>
 to ensure that there are no more solutions to request to
 this goal.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>true if this query is still running in the Prolog side,
          or is expecting <code>nextSolution()</code> requests.
<DT><B>Throws:</B>
<DD><CODE><code>IOException</code></CODE> - if there are any error on
            the sockets.
<DD><CODE><code>PLException</code></CODE> - if there are any error on
       