Assume teachers, students, engineers, shoppers, salespersons, families teach, learn, collaborate, buy, sell, socialize via electronic versions of traditional human interactions combined with shared objects 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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Best sharing must support cross disability rendering
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