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Web collaboration requirements:
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Capture and propagation of application events: user actions in one application are reflected in other applications
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Selection of relevant events: not all events need to be shared
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Specification of event target components: each event must have the recipient component which knows how to interpret the event
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Transfer of arbitrary data: enables information exchange among collaborative tools
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Access to the collaboration session state: used to support collaboration awareness or assure synchronized access to the session resources
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Integration with the Web environment: encapsulation of Web specific communication mechanisms enables creation of portable and generic applications
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