Im going to attempt to help you out but you going to have simplify this a tad bit more ..
I need you to tell me which pc do you want to be master and which pc you want to be the slave ....
and then Im going to need you to explain to me in simple detail exactly what you are trying to do.
I have a idea but im trying to make sure I do understand.
what Im thinking is ... you want one pc as the main sequencing workstation and you want you other pc contribute some of its own elements to the project via midi...
Let me know if this is the case. And I will see If I can map out a solution for you.