Public Event PresenceChanged As EventHandler(Of PresenceChangedEventArgs)
Before this event can be raised, the current user of the remote peer must subscribe to the collaboration events of the host peer. Subscription is accomplished via the Subscribe method.
This event requires a PermissionState of Unrestricted.
Supported in: 4.6, 4.5, 4, 3.5
.NET Framework Client Profile
Supported in: 4, 3.5 SP1