e">DbChannel::send_request()</code> method
        sends a message on the message channel. The message is sent
        synchronously; the method blocks waiting for a response before
        returning.  If a response is not received within the timeout value
        configured for this request, this method returns with an error
        condition.
    </p>
      <p>
        If you do not want to block while waiting for a response from a remote
        site, use the 
        <a class="xref" href="dbchannel_send