esentation of a sorted, balanced tree structure.
            </p>
          </li>
          <li>
            <p>
                  <span class="bold"><strong>-hash</strong></span> 
            </p>
            <p>
                 Open/create a database of type Hash.  The Hash format is an
                 extensible, dynamic hashing scheme.
            </p>
          </li>
          <li>
            <p>
                  <span class="bold"><strong>-queue</strong></span> 
            </p>
            <p>
  