Synergy+ lets you share a single mouse between multiple computers

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)