Presence has been gradually seeping out from IM over the past few years into other applications, notably in the XMPP/Jabber community where presence is a key (it’s the first ‘P’ in XMPP!). The benefits of using XMPP are mainly that it’s an open, documented and extensible standard which allows anyone to make use of it. In an article called Say...

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Google Talk is finally out and is based on XMPP for text chat. This means that any normal Jabber client can also connect to Google’s servers and use it. At the moment you can’t use Google Talk to connect to the wider Jabber network, and I can’t see that this will change any time...

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