Thanks to all those who have replied so far.
A couple people have asked, in one way or another, "Who is it that ultimately gets
value from this use case?"
What the use case accomplishes is that the information is the system's database is
more up to date after each execution than immediately before. Who cares about that?
Several actors who get that value through other use cases in which they interact with
the information that this use case updates.
They do not however participate in this interaction between my system and an external
system, and may not in fact be aware that it even happens.
Since they do not initiate, participate in, or know about this use case, I have
trouble thinking of them as actors.
Frank.
-----
The very act of seeking sets something in motion to meet us;
something in the universe, or in the unconscious responds as if
to an invitation. - Jean Shinoda Bolen
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