> I see another problem: I doubt, that the IP adress can fully identify
> a user, if you have proxies or firewalls in between.
C) Hmmm... I'm going to take the advice of kicking off the slow
process in a new thread, and returning a monitor page. In doing
so I will have the thread ID of the new thread, and that alone
will be sufficiently unique to pass back and forth as an identifier
for the progress monitoring.
I'm grateful for the discussion, suggestions, and sound advice I
received as a result of posting on this subject.