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In this paper, the authors discuss interaction interoperability in Collaborative Virtual Environments (CVE), intended to mean the ability of two or more users to cooperate despite the heterogeneity of their interfaces. To allow such interoperability, rather than focusing on the de-coupling of input devices from interaction techniques and from interaction tasks, they suggest integrating interactive systems at higher level through an interface standardization. To achieve this aim, they propose: an architectural model able to handle differences in input devices and interaction tasks; an agent-based middleware that provides basic components to integrate heterogeneous user interfaces.
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