1. To toggle KVM and Audio focus between ports (Press "Scroll Lock" key twice + "Enter" key)

2. Only toggles the KVM focus (Press "Scroll Lock" key twice + letter "K" + "Enter" key)

3. Only toggles the Audio focus (Press "Scroll Lock" key twice + letter "S" + "Enter" key)

4. When the Mouse Switch function is activated, switches to the next PC (Press the mouse "Wheel or Scroll button" twice). 

To activate Mouse Switch, press "Scroll Lock" key twice + letter "W" + "Enter" key (By default, this feature is off).

For details, please refer to below video clip.