HighSecLabs SC21H-3 User Manual page 29

5-button mouse operation
As mentioned, default channel after power up is channel #1 as
indicated by channel select LED #1 illumination. Device control is
done using the 5-buttons mouse and display interaction.
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The use of 5-buttons mouse enables the user to fully use all standard
wheel mouse buttons for application specific tasks and still operate
KVM Combiner specific functions using the 2 extra side buttons.
The user may easily toggle between User and system mode by
pressing one of the +/- side buttons.
2/4 Ports Secure KVM Combiner User Manual
Section 5 - Troubleshooting