Messenger Assembly Messenger_Instance First_Receiver_Instance Second_Receiver_Instance Administrator_Instance Messenger_to_First_Receiver_Publish message_publisher message_consumer Messenger_to_First_Receiver_History message_history message_history Messenger_to_Second_Receiver_Publisher message_publisher message_consumer Messenger_to_Second_Receiver_History message_history message_history Messenger_to_Administrator_Control control runnables Messenger_to_Administrator_Content content content Subject Mapping subject subject