    between the client and the server.</dd>
      <dt>Request</dt>
      <dd>
            The message that frames a call and its parameters.</dd>
      <dt>Response</dt>
      <dd>
            The message that frames the result of a successful call or the error in the case
            of a failed call.</dd>
      <dt>Result</dt>
      <dd>
            The answer for a successful call.</dd>
      <dt>Error</dt>
      <dd>
            The answer for a failed call.</dd>
      <dt>Notification</dt>
      <dd>
 