Prime app variables

[Bob Frazee]

I have a similar problem.
I us an App(customized Solve App) to call the Windchill program.
The WindChill program calls the following subroutines (functions?), all are EXPORTED.
IntroScreen: Uses variables DegF, Mph
InputScreen: Creates variable DegF, Mph
WindChillEqn: Uses variables DegF, Mph, Creates variables wct, wcto
FrostbiteEqn: Uses variables DegF, Mph, Creates variable ft
OutputScreen: Uses variables DegF, Mph, wct, wcto, ft
How do I allow all of these programs to share variables with out making them global? In a conventional programming language, I would pass them as parameters, ie WindChillEqn(DegF,Mph,wct,wcto,ft), but that procedure doesn't appear to work in this language. Any help would be appreciated.
rcf