Can a running exe call another exe and pass a reference of itself to the called exe?

I have a solution that has become so large, that I am inclined to develop future modules as separate solutions (exe's). i want to be able to refresh data from the calling exe when I am disposing the called exe. I want to be able to call my refresh data subroutine in the calling exe when I'm disposing the called exe. Does anyone know if this is possible?