A distributed and policy-free general-purpose shared window system

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Abstract
Shared window systems allow collaboration-trans- parent, single-user applications to be displayed and interacted with on multiple users' workstations, enabling the members of a cooperative ensemble to simultaneously share and revise informa- tion. This paper presents a system capable of sharing applications running under the X Window System. In contrast to previously implemented systems, our shared window system addresses issues that are crucial for general-purpose use. Our shared window system is policy-free, i.e. there are no pre- ferred policies for handling issues such as admission and floor con- trol. Instead, it offers a set of essential mechanisms on top of which various policies and user paradigms may be realized. Further, the system distributes the sharing functionality among all sites in- volved in a cooperative activity. Measurements have shown a pos- itive impact of this on the overall performance of the system and thus justified the viability of the design decisions taken.

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