That's wonderful. I used OS/2 for a bit as a young man and loved it. As a professional developer-in-the-making, I learned REXX as well (although in college we were using it on IBM big-iron at the time too). I can't remember what class it was, but I was daydreaming and wrote an arbitrary (integer) root finding algorithm in REXX one day. eg: show me the 6th root of 872378294, using a variation of finding a square root iteratively.