Thanks everyone. I've asked a lot of questions here, mostly things
I've wondered about since I was a kid in the 60's. I think I've asked
all of the questions I had, and I've gotten feedback on all of them.
I'm going to be leaving this newsgroup within a couple of weeks for
two reasons (1) I have no more questions, and (2) I'm in the process
of changing ISPs.

Thanks to everyone here that gave such informative answers - there are
some real experts here.