@steve's, And, as you can imagine, it is difficult to do any kind of half-decent job in a format like this... especially since there are whole reliable textbooks devoted to the subject, so why bother with me. ;-) Anyway, I am trying but since I have other responsibilities in my life - a wife, a job, two cats, a book to write, three grad students to supervise, and MEETINGS! I am going to have to give this stuff a rest. I appreciate people are curious - if a bit confrontational in the way they choose to engage in the subject - but relying on only one person to talk about an entire subject is not fair to that person nor does it do the subject the proper justice.