[PLUG] Multiple TCP/IP connections application question

[Matt Alexander]

Let's say you have two instances of the same program that are both
accessing the same remote IP address and service.  When the packets return
to the OS, how are they redirected to the right program instance?

For example, if you had several instances of a script that was sending
different GET/PUT data to a website and returning different results.  How
are the results matched up with the correct calling program?
Thanks,
~M