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The example uses three idealized (not present in real message passing system) primitives
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Message Passing Shift to right MPSHIFT (+1, SOURCE, DEST)
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Sends 1 word in location SOURCE to processor on the right
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Receives word in location DEST from the processor on the left
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SOURCE and DEST are locations -- if set to "DUMMY", then no information is to be sent or received
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Message Passing Shift to left MPSHIFT (-1, SOURCE, DEST)
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Sends 1 word in SOURCE to processor on the left
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Receives word in DEST from processor on the right
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GLOBALMAX (TEST)
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takes TEST from all processors
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forms TESTMAX = maximum value of TEST over all processors
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replaces TEST by TESTMAX in all processors
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