d thread ID identifier
         pair for display into a caller-supplied buffer.  The function must
         return a reference to the caller-specified buffer.  The
         <code class="methodname">DB_ENV-&gt;set_thread_id_string()</code> method supports the 
         <a class="xref" href="envset_thread_id.html" title="DB_ENV-&gt;set_thread_id()">DB_ENV-&gt;set_thread_id()</a> 
         method.
    </p>
      <p>
         The <code class="methodname">DB_ENV-&gt;set_thread_id_string()</code> method configure