Hi Mike!
Thank you for that answer! I really do need to have separate sites for separate clients. As far as 'minefield' I believe the term is to describe an area that is dangerous. I think during the Vietnam War there were mines placed in the ground so that they blew up whenever some unsuspecting person stepped on them. I realize processwire is not a bomb, but that was just an example for how I see a bad situation making a mistake in Processwire.
Thanks for your input Pwired, but I need to create separate sites. In the future I may do a multisite so the information you gave me was helpful.