From: Javier <grijalba@cvtci.com.ar> >Thanks for the answers!!!Another thing what is RPN ??? Reverse Polish Notation. Instead of entering 2 + 2 = you enter something along the lines of 2 enter 2 +. The first value is stored in a register when you hit enter and the second number is added to that register when you hit the plus. Its a much easier way for computers to do math, and once you are used to it its supposed to be faster to use. DK