code: public base_response logout() throws Exception
  	{
  		base_response result = null;
  		logout logout = new logout();
  		result = logout.perform_operation(this);
          sessionid = null;
          user_name = null;
          password = null;
  		return result;
  	}
docs: <pre>
  Use this API to logout from current session.
  @return status of the operation performed.
  </pre>