Avatar --- virtual self selected by / assigned to participants that represents them in televirtual spaces.
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Avatars are scripted in VRML and stored in "ID Servers" where they can be retried upon request by browsers.
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ID Server --- handles user identity and manages user appearance.
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Users register with ID server and bind their identifiers with their avatars.
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Motion Server --- Multiuser server receiving motion events from participants and broadcasting the state information (including other avatars) back to users.
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Multiserver --- a concept of maintaining several cooperating services in a single node or distributing it over nodes depending on the load and the network capabilities.
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