Also looks like you need the Synergy 3 Ultimate version for hotkeys, maybe try the free trial to see if it still works.

Another idea is using multiple USB IR receivers for each computer and a single IR remote controller to trigger the keyboard shortcut.

Best of luck Lua (^v^)b

Looks like this should be possible with Synergy

superuser.com/questions/49...

And possibly using the GUI??

superuser.com/questions/37...

The documentation for this looks nonexistent but can be found at deskflow the free open source side of synergy.

github.com/deskflow/des...