I got it. This is a very useful prog indeed. It alresdy caught some seroious crashes and saved my memory from clearing. In fact, crash protection is very good here and if your Basic program crashed the calc (yes sir, its possible) CP will even show what line it happened on not just prevent crash. GJ goes to Greg!
I created many progs on my calc before that went beyond basic in terms of speed. one day my calc kept chrshing for no reason at all. it was either one of progs or because i dropped my calc too much.