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In this paper we describe a novel Model-View Controller based architecture, Centralized Control, that intro duces collaboration in single-users applications. The architecture is able to add collaboration with no need to modify the source code of the original single-user application, and providing also the capability to introduce group semantics into the new, collab orative application that is obtained. The architecture is shown in practice, by introducing CollabXMind, a collaborative mind map tool, that is based on a well-known single-user tool, XMind.

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