I guess you'd have to explain, a little more, what you mean by 'process'.
Did you start another process on the machine with System.exec?
Do you mean another
Java thread?
Can you describe this other process, how it was started, and how you were able to obtain a handle to it in your servlet?
I'm thinking this is no longer servlet specific.
Where it should go depends on your answers to the questions above.
-Ben