ference Guide</em> for more
                 information.
            </p>
            <p>
                If more than one in-memory database is desired, it is
                necessary to specify an empty string as the database name.
                For example:
            </p>
            <pre class="programlisting">berkdb open -create -btree "" foo 
berkdb open -create -btree "" bar  </pre>
            <p>
                will create two databases, neither of which will appear on
                disk.
