Variables in a Program(A,B)

[matalog]

Okay, I get it now. Those variables will enter the program, but will remain as they were initially defined by the calling of the program in the program name, although A and B will be updated and used as required by the program.

I was redefining them within the program, and although it was not outputting them in the program name, they were being used as re-defined in the program. Now that I have removed the input lines, I understand the way it works.