I finally figured out how to make this little application work and it is really cool. Once you install the Synergy+ app on your main computer and install the same app on your other computers, you can share one mouse and keyboard between multiple machines!
Interesting features include:
- Move your mouse easily between computers
- Requires nothing other than existing ethernet
- Copy and paste between your computers
- No need to press any buttons (unlike KVM)
- You can still use multiple monitors on the same computer
- Lock the mouse to one screen temporarily (useful for games)