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Assume teachers, students, engineers, shoppers, salespersons, families teach, learn, collaborate, buy, sell, socialize via electronic versions of traditional human interactions combined with shared objects expressed now in HTML and soon XML and rendered as web pages
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Most sharing is asynchronous and one usually wishes to share synchronously same material that one accesses asynchronously
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objects can be (electronic) text books, aircraft designs and simulations, expensive jewelry or photos of grandchildren
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