| Class Summary | 
| MessageBoxKey | This is the identifier for a message box. | 
| MessageCentreImpl | Storage and retrieval of portlet message mappings, and the messages. | 
| MessageConfig | Access to messaging configuration: message.PortletMessaging.properties You
 can define classes to use for the MessageStore ("message.store"), and
 SessionIDRetriever ("session.id.retriever"). | 
| MessageHelper | This is intended as the main interface between portlet code and the messaging
 system. | 
| MessageUtils | Some functions for use with the dynamic mapping form. | 
| MessagingFactory | Generates objects based on configuration settings in MessageConfig |