Oh believe me, I know the power of VWD; but I also know how slow I am to understand certain concepts (perhaps that's why I was a good teacher, according to most of the kids I taught; I could understand why they couldn't and so I'd try as many different ways to explain it that I could think of - even letting kids that did understand have a go at explaining in their own way). And with a recorded IQ of 196 (on par with Einstein, apparently) - so much for IQ tests (all they show is how good you are at taking IQ tests..............lol). Rather than fill 5 - 10 pages of this forum thread with people trying to explain (for which I am grateful - the people on this forum are great), I'll wait for the new user guide and work from there - it will give me a sound base from where to start and will help me to understand when I need others' help. Thanks again for the effort, guys & gals............. But, don't forget - anyone wanting to write a tutorial; I'm at your disposal (but hope not to be disposed of.........).