code: def open_os_message_channel(self, include_refresh_messages=True):
          
          body = {'include-refresh-messages': include_refresh_messages}
          result = self.manager.session.post(
              self.uri + '/operations/open-os-message-channel', body)
          return result['topic-name']
docs: Open a JMS message channel to this partition's operating system,
          returning the string "topic" representing the message channel.
  
          Parameters:
  
            include_refresh_messages (bool):
              Boolean controlling whether refresh operating systems messages
              should be sent, as follows:
  
              * If `True`, refresh messages will be recieved when the user
                connects to the topic. The default.
  
              * If `False`, refresh messages will not be recieved when the user
                connects to the topic.
  
          Returns:
  
            :term:`string`:
  
              Returns a string representing the os-message-notification JMS
              topic. The user can connect to this topic to start the flow of
              operating system messages.
  
          Raises:
  
            :exc:`~zhmcclient.HTTPError`
            :exc:`~zhmcclient.ParseError`
            :exc:`~zhmcclient.AuthError`
            :exc:`~zhmcclient.ConnectionError`