Yes, Gary, the manuals are difficult to understand and follow. BUT I have to tell you sometimes even forum members explanations are equally hard to follow. I really do appreciate all the help given here and at PSRTutorial but sometimes this stuff just takes this old dog a little longer to get. Soooooo..... when a dummy like me asks what seems like the same question 3 or 4 times it may be that what is easy for the writer to understand is just way over the head of the reader. Fact is, I am somewhat embarrassed by my inability to get a concept when presented. My only saving grace has been, once I get it, I usually have it and that tends to open up more areas of the OP to persue.