C2G 35554 TruLink 2-Port VGA USB 2.0_PS2 KVM Switch - Manual (Page 15)

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C.
“PC 2 On” indicates the second port has a PC connected to it, the PC is on and the active
host. The first port either has NO PC connected to it, or the PC is connected, but not on.
D.
Both ports have PCs connected and on. The red letter and larger numeral indicates the
second port is the active host. The green letter and smaller numeral indicates that the
first port is NOT the active host, but is available for connection.
Switching the active host using the OSD program
Using the mouse, simply click on the button of the port that you want as the active host. The
program will automatically switch the active host and the numbers on the button will change
accordingly.