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Basic operations are SEND and RECEIVE
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But there are a lot of subtleties
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How does program 2 know what message passing it is getting ? Does it come from program 1 or another one ?
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Does program 1 get an acknowledgment (analogous to certified mail) ?
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Do we use system or application level implementations ? -- raises issues of protection, copying
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Broadcasts, Multicasts -- other collective or multiple message/source/destination communications
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Do we have multiple processes or threads per processor ? -- How do we address?
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