1. A method of managing a computer-implemented animation process for multiple participants, comprising: animating motion of respective ones of modeled avatars in a modeled VRU environment each independently responsive to respective ones of multiple separate command streams provided to a host computer; initiating a coordinated motion sequence at the host involving the modeled avatars; in response to initiating the coordinated motion sequence, animating coordinated motion between the modeled avatars to provide animation data, such that at least one of the multiple separate command streams controls at least two respective ones of modeled avatars that, prior to initiating the coordinated motion sequence were independently animated in response to respective ones of the multiple separate command streams; and providing animation data for display of an animated scene depicting the coordinated movement.