I can give you individual examples

Thanks, they were illustriative.

To properly describe all the issues involved would take a book - or at
least a long article.

It would probably be a =very= useful long article. You could post it as
a series. In fact, I wonder if Jay's website might be a good place to
put such things...

Jose
--
The monkey turns the crank and thinks he's making the music.
for Email, make the obvious change in the address.