Get the name of the process that sent me the controlgettext

[AHKStudent]

I have one main ahk compiled program and then I have many smaller exe's (ahk built) that send a controlgettext to the main program in order to get information.

Is there a way that I can detect in my main program what process sent the controlgettext request?

I figured since its all AHK maybe there is a way to detect via onmessage?