(maybe) a stupid question regarding MCDU

Hey Guys (and Girls),

I am currently building my own MCDU, it´s no professional solution, it will be built based on Arcaze or Arduino.

I wonder about the following: I currently run the software CPU on a 8" touchscreen monitor in the network on the second of my 3 PC´s.

Now, if I use a hardware MCDU, must this be connected to the main PC? Or how can I get the button presses to the main PC? Or can I run the MCDU soft on both cumputers, the main PC receiving the button inputs and the secondary PC showing the display only?

Any ideas?

Thank you,
Stephan