Input Director in mirror mode. The VM on the far left is the master and the other 3 VMs are the slaves - anything I do with the mouse/keyboard on the master VM is mirrored on the other VMs, so they all operate simultaneously.

The 2 clients on the far left are running on the machines native OS, since once those get into the mission, start tanking, and assign drones to the main master DPS ship, they won't need to be touched.

I'm not just planning, in that picture I'm testing it, it works.