Consistency is a crucial requirement for Massively Multiuser Virtual Environments (MMVEs). Such systems provide virtual worlds in which thousands of users can interact in realtime. To realize a consistent world view for all users, a flexible consistency management is required which balances the responsiveness and the level of consistency in the system. In this paper we present an approach for a consistency management for peer-to-peer-based MMVEs. The approach identifies users which actually interact with each other in the virtual world, groups them in consistency sessions and synchronizes all users in the session according to a synchronization protocol which is determined at runtime. We discuss the concept of consistency sessions, present algorithms to create and maintain sessions, and analyze what features are still missing and must be added in the future.
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