Real-time collaborative graphics editing systems allow a group of users to view and edit the same graphics document concurrently from geographically dispersed sites connected by communication networks. The systems can be used in collaborative computer-aided design (CAD) and computer-aided software engineering (CASE) systems, electronic conferencing/meeting, and collaborative virtual environments. To effectively support collaborative work, a collaborative editor should be able to respond to a user's local actions as quickly as possible. To achieve high responsiveness in the Internet environment with a long communication latency, shared graphics objects must be replicated at all collaborating sites so that local operations can…
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