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I did some UI work with the guys who made Qunu. They used similar techniques for in-browser chat: Erlang, "binding" via AJAX long polling. It was pretty advanced stuff at the time (3-4 years ago) - I believe other in-browser chat services like Meebo used polling.

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I worked on a project similar to these and did a bit of research on existing solutions. If I remember correctly (I'm trying to find the document) Meebo uses a custom lighthttpd and does long polling.

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