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Programming Portal Eventing 
The SAP Enterprise Portal supports client-side eventing. This allows different Web Dynpro applications to communicate with one another and also with any iView with portal content.
You can subscribe to- and unsubscribe from specific portal events. This means that the SAP Enterprise Portal can react to an event that is triggered by a Web Dynpro application.
To use portal eventing you have to define which Web Dynpro action is used as the event handler for the portal event. You can fire any portal event.

Note that portal eventing only works properly if all participants (i.e. the portal server itself and all the servers used) are in the same domain. Otherwise portal eventing does not work.