Definitions

Definitions of the terms used in presence-based communications and collaboration applications are given below.

Parameters

• Presentity
  The entity whose presence information is tracked. The Presentity registers its status, location, and other attributes with the Presence (registrar) Server.

• Presence
  Presence is a service that can implement the following functions:

  • Registration/Deregistration
    A service that provides the update of Presentity capabilities, location, and online status.
  • Query
    A Watcher can query for Presentity status. A message-routing service can also query for status, which it uses in routing decisions.
  • Notification
    The Watchers are notified of changes in the Presentity status.
  • Subscription
    Subscription/unsubscription allows a Watcher to register its interest in a Presentity.

• Buddy
  Same as Presentity. The entity whose presence information is tracked. The Buddy registers its status, location, and other attributes with the Presence (registrar) Server.

• Watcher
  The entity to be informed of the status of the Presentity or Buddy. The Watcher can query for the status of the Presentity, and is notified of changes in the status of the Presentity.

• Whiteboard
  An application that displays a window for two users to exchange information.

• Application Sharing
  The ability to share an application between two computers, both of which can view and interact in the session.