Setting environment variables within a C program.

[Jerry Bakin]

Hi,
  I understand that if I type

 freds_wife = Wilma
 export fred_wife

from the shell, I can access freds_wife within a C program by using
getenv.

How do I change the value of freds_wife from Wilma to Betty within the C
program, and get the environment to understand the change later?

Jerry <Bakin at HI-Multics>