We have Postal Services, electronic mail/newsgroups/listservs which generalize to web linked database supported mail archives with suitable JavaScript framework
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We have Phone which generalizes to Chat Servers and Forums where "mail" (lines of chat) are in real time but logically equivalent to mail services
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Video Conferencing/Face to Face Meetings map into a set of interactive tools
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Shared White Board
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Shared Multimedia Information
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Talking Heads
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These need digital video, Java Servers and clients etc.
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Unclear performance and utility -- systems being deployed now
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Can have intutitive metaphors e.g. separate rooms in a Java Applet
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or the full (soon to be VRML 2.0) Televirtual Environment as provided by several experimental servers with many users in a realistic simulated world
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