IOGear GCS1204G - Manual (Page 16)

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* The USB ports cannot be switched independently of each other.
Hotkey Action
[Scroll Lock] [Scroll Lock] [Enter] Increments the KVM, USB, and Audio focus to the next
higher port ( port 4 wraps to 1)
[Scroll Lock] [Scroll Lock] [K] [Enter] Increments only KVM focus to the next port
[Scroll Lock] [Scroll Lock] [U] [Enter] Increments only the USB hub to the next port
[Scroll Lock] [Scroll Lock] [S] [Enter] Increments only Audio to the next port
Cycling though the ports