. This position paper briefly reviews how we created virtual worlds for a real-time, multiparty simulator. These worlds are partitioned into regions. Some regions are displayed as three-dimensional objects, and other regions are displayed as still images or video streams. We hypothesize that the size and placement of these regions can be configured to accommodate various user requirements. Such configurations can be based on static descriptions of the computing and communication resources that are available to users. We also hypothesize that dynamic region configurations can be used, in distributed systems, to accommodate run-time variations in computer and network performance. These configuration changes can be based on real-time measurements of system elements. 1 Introduction We are building virtual environments that combine two types of sub-spaces or regions. Some regions are displayed as three-dimensional objects, and other regions are displayed as still images or video..
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