A multi-user Virtual World has been implemented combining a flexible-object simulator with a multisensory user interface, including hand motion and gestures, speech input and output, sound output, and 3-D stereoscopic graphics with head-motion parallax, The implementation is based on a distributed clientherver architecture with a centralized Dialogue Manager. The simulator is inserted into the Virtual World as a server. A discipline for writing interaction dialogues provides a clear conceptual hierarchy and the encapsulation of state. This hierarchy facilitates the creation of alternative interaction scenarios and shared muhiuser environments.KEYWORDS: user interface management system, dialog manager, virtual worlds, virtual reality, interactive lation. BACKGROUND A Virtuat World is an interactive, multisensory, dimensional environment where human-computer

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