Maintenance of Tab Page Notification 
Use
The specifications you make on this tab page define the notification agent for completion. This entry is optional.
These notification agents receive a
notification of completion when the relevant work item is set to status completed.Activities
Enter a message recipient for completion. For further information, refer to
Defining Responsibilities.If no recipient is entered, no notification of completion is sent. The notification of completion contains the completion text that can only be
processed in the task definition, and a reference to the work item display of the completed work item.