Multi-letter variables in RPN

[Arno K]

My opinion on RPN and Prime is, leave it. I once bought the prime when I read it had PRN and, to tell the truth, I never really used it. I recently bought a 50G, it now is sitting in a drawer. I mostly use the Prime's CAS (Home only for number crunching) because of its capabilities and not to forget its speed, and I really like the touch screen. I think it is the best calculator I ever owned (that are a lot beginning in the late seventieth).
Arno