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The
arrows in this drawing show the relationships among the functions—which
functions talk with each other or pass each other messages of one sort or
another.
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You’ll
notice that one of the arrows is bi-directional;
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it
indicates that some sort of request and response conversation goes on between
the two functions it joins.
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You can
also see that two functions interact
with other functions outside the boundaries of this story.
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What is
the nature of all these interactions?
They all have this in common: the functions communicate with each
other by passing information to each other. The arrows show the direction the
information travels.
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Let’s call the individual packets of
information “messages”.
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I’ve
added the names of the messages to the next slide.
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