According to the documentation, "Rather than terminating immediately,
exit() will cause the sketch to exit after draw() has completed (or after
setup() completes if called during the setup()
method)." But, this is not the behavior that I'm seeing. My program appears
to continue running indefinitely, i.e., draw() and move() are invoked again
and again after my program has called exit().

i need an example.

OK. It looks as though I've misunderstood how this is supposed to work. I
was expecting `exit()` to terminate the processing environment, and it
doesn't do this. This might just be a documentation issue.

Thanks!

Phillip