Presence protocol allows you to know who is subscribed to a channel, this makes it easier to create chat applications and know who is online, example: game users, chat rooms, users viewing the same document...
By default user is identified by a name, but this can be customized passing more data: email, company, twitter...
Events to Authorize if a Channel can be created, if a member is allowed...
Publish messages to all channel subscribers.
TsgcWSPServer_Presence: Server Protocol Presence VCL Component.
TsgcWSPClient_Presence: Client Protocol Presence VCL Component.
TsgcWSPresenceMessage: the object which encapsulates presence packet information.