Presence information watcher is an entity that requests presence information about a presentity from a presence service. Usually in order to get presence information a watcher have to subscribe for it to a presence server. When subscribed, the watcher receives event notifications as presence information changes. Alternatively watcher may fetch presence information without subscribing to it.
Famous quotes containing the word watcher:
“Ships at a distance have every mans wish on board. For some they come in with the tide. For others they sail forever on the same horizon, never out of sight, never landing until the Watcher turns his away in resignation, his dreams mocked to death by Time. That is the life of men. Now, women forget all those things they dont want to remember, and remember everything they dont want to forget. The dream is the truth. Then they act and do things accordingly.”
—Zora Neale Hurston (18911960)