I avoid the cheap joke in the typo of the last posting, and only remark that I am a lousy example, and my schools were lousy examples. I got no guidance and no hints of what was possible in all that time. I am not blaming anyone: I was a lazy bastard, and should have got off my a** and used my head. Stupid waste of about 30 years. If anything I understate what I owe to Mudcat: it pointed out that I knew a ton of what was going on here -- I just had no real way of getting it together (as we used to say in the 60's). yours, Peter T.