Basic architectures
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Shared display: single instance of application, user input & display replicated via conference agent
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Entire functionality of application is shared
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Examples: Shared X (HP), NetMeeting (MS), ProShare (Intel), ShowMe (Sun), Timbuktu (Farallon)
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Advantages: simple to implement
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Disadvantages:
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functional: simplistic, inflexible, awkward session control model, insecure (no data access control), no support for asynchronous collaboration, race condition problems
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performance: generate heavy data traffic, unacceptable on WANs
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incompatible with Web programming model assuming local intelligence
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