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
notice that one of the arrows is bi-directional;
indicates that some sort of request and response conversation goes on between
the two functions it joins.
also see that two functions interact
with other functions outside the boundaries of this story.
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
| Let’s call the individual packets of
added the names of the messages to the next slide.