Bill,
You ask such good questions, and I am afraid that I don't have any good answers, as PN is not something I know a lot about. There are others who are experts, so I will let them take the floor while I welcome you.

If you didn't know, the original forum was down for a long time and a kind man, Dr. John, set up this in its interim. The original forum has come back online and some folks have stayed here, but most in the NM forum have migrated back.
Email me at kmaggio!@earthlink.net if you need the other address.

Mama