Latecomer and Crash Recovery Support in Fault-Tolerant Groupware

In a real-time collaborative system, one user's actions must be instantaneously propagated to all the other current participants. A session might start with some users, others might join inlater, and still others might leave and join again. Unlike stateless collaborative applications such as videoconferencing and discussion groups, state-full collaborative applications must offer latecomer and crash recovery support. Such applications include shared electronicwhiteboards, chat rooms, collaborative design, collaborative virtual worlds, and multiplayer games.

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