We have 1 computer that runs our lyrics, manages our live stream, controls our PTZ cameras, plays preservice music, updates lyrics, create new graphics, etc. It can be a bit overwhelming to run all that on your own. We build our computer to connect to 2 monitors and a projector or TV screen. We have multiple volunteers working on the same computer. Typically regardless of how many mice and keyboards you have plugged into your computer it still treats it as just one, but using MouseMux we have 1 mouse for the lyrics and another for running the live stream and PTZ camera. Hopes that helps someone.
MouseMux Version 2 is out and is paid, but personally it's caused me more problems than version 1 which is free