Is their a way for a Child process to modify its Parent's environment?

[WhatMeWorry via Digitalmars-d-learn]

I open a command line window, and run the following 6 line program
void main()
{
   string envPath = environment["PATH"];

   writeln("PATH is: ", envPath);

   envPath ~= r";F:\dmd2\windows\bin";

   environment["PATH"] = envPath;

   envPath = environment["PATH"];

   writeln("PATH is: ", envPath);

}

It prints out the following

PATH is: C:\Windows\system32;C:\Windows...
PATH is: C:\Windows\system32;C:\Windows...F:\dmd2\windows\bin

when the program exits, I'm back at the command line and I do a

echo %PATH%

which just shows C:\Windows\system32;C:\Windows...

Anybody know of a way to make the change stick for the lifetime 
of the
command window?