[Tutor] sockets, files, threads

[Marilyn Davis]

Danny!  I couldn't resist trying threading again, now that the
mysterious single-threading behavior is gone.

I didn't put any locks anywhere.

And it runs like a champ.

Like a super champ.

Either I had to put back threading or I had to make a family of
socket-readers, or lose some functionality in my test scheme.  So I
gave it a shot.

And, I'm very happy.  Thank you again.  

Marilyn

p.s. I hope you're well.