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Some sort of activity involves interactions between objects and/or objects and individuals (which can be thought of as objects as well if you want)
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| 2 |
Interaction can be synchronous as when individuals talk to each other; parallel program components exchange MPI messages
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Objects or object properties are shared at same time
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| 3 |
Or asynchronous when sharing is done at different times
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| 4 |
I post a web page and you look at it later is basic asynchronous sharing model while writing on a blackboard is hallowed synchronous model in teaching
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