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User Presence provides you the opportunity to detect the important moments when a User Joins or Leaves. This allows you to build applications that require knowledge of users connection state in groups. Especially valuable for multiplayer games and communication apps where multiple people will connect to the same channel socket.
Socket.IO on PubNub - github.com/pubnub/pubnub-api/tree/master/socket.io
PubNub Website - pubnub.com/
GitHub Repository - github.com/pubnub/pubnub-api/
Stephen Blum plus.google.com/117012892116407849084/about