John, Glad to see you're making progress. Hope to find time to review your work. My major accomplishment for yesterday was to buy 20 computer related books (5/6 were AI related). Who said the credit card bill would not be as large this month as last? I'm a book addict. I don't read them like I should, but I like to buy them. I found several in the local computer store's bargain bin. One was $.99 and one of the others I purchased was $70. Most were somewhere in between. I have not seen AI related books at the book stores till yesterday. Yesterday, I found a whole shelf of them at a couple of Border's stores. I'm pretty sure they did not just appear. Several did have 2002 copyrights though. A couple of them are really thick and from just glancing through them they're really theoretical. I had enough math to have a math minor in college (back in the '70's), but I seldom really understood math until I could apply it in some practical way. I'm not sure if I'll get much out of those books, but I'm sure I won't if I don't attempt them. I've had a couple of the sharpest programmers that I know tell me that AI is not practical. One said I should not waste too much time on it. They're probably right, but wouldn't it be cool to harness the power of these machines to do more for us than they currently do? I really don't care if they can start with nothing and learn. If they can just follow a set of rules and assist with various repetitive, mundane, tasks without someone having to define each step exactly as it is to be performed, I think that's worth exploring. Unfortunately, I think I feel a nap coming on. I'm sure, if I attempt one of those new books, it will win. David Garner