            or <code class="literal">DB_DBT_USERMEM</code>.
             </p>
          <p>
                 For more information on configuring and using
                 Dbts, see 
                 <a class="xref" href="dbt.html" title="Chapter 4.  The Dbt Handle">
                The Dbt Handle
        </a>.
             </p>
          <p>
                 Note that the response Dbt can be empty. In this
                 way an application can send an acknowledgement even if
                 there is n