🚀 go-pugleaf

I'm told that a program is given a copy of the environment variables, so any
changes/additions made are lost when the program ends. There must be some
way around this limitation?

Specifically, I want a batch file that runs a Quick C program, then calls another batch
file based on an environment variable:
       :top
        menu (quick c program)
        if %prgm%=exit goto done
        call %prgm%
        goto top
        :done
(The above batch file may not be syntactically correct, but you get the idea?)

Any leads on permanently setting env. variables in the DOS shell that 
called the Quick C program are appreciated.
Thanks, John Valenti
Valenti@msu.edu