Here is my scenario:
1) I open MP and connect to the 2 secondary machines via KVM mode - works fine
2) I open notepad and give it focus on both secondary machines
3) I go back to primary machine, open notepad - ctrl 3x and type "test"
4) test shows up as expected on primary, nothing happens on either secondary
What I expected to happen was test to show up in all 3 machines.