ies (with caching) or a distributed (cache-only) consistency protocol. There is a tradeoff between consistency and throughput. 2 M. Mine and H. Weber, "Large models for virtual environments: a review of work by the architectural walkthrough project at UNC," PRESENCE: Teleoperators and Virtual Environments 5 136-145 (1996); T. Funkhouser, S. Teller, C. Sequin, and D. Khorramabadi, "The UC Berkeley system for interactive visualization of large architectural models," PRESENCE: Teleoperators and Virtual Environments 5 13-44 (1996). 4 version of MPI, 1 remote procedure call, remote I/O, and maintenance of shared state in collaborative environments. MPI, CC++, CORBA, ... IP, ATM, Shared memory, ... Global services Local services Nexus protocol LEGION Legion is a object-based metasystem developed by Andrew Grimshaw of the University of Virginia. . Legio
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