ATEN ACS-1602 - Manual (Page 11)

Port Selection
Simply press the Port Selection switch on the ACS-1602’s top
panel to toggle the KVM focus between the computers (ADC1,
ADC2). The Selected LED on the top panel lights to indicate
which port is active.
Note: For the Mac, if any USB storage devices are attached to
the ADC’s USB ports, the following warning message
appears when you switch ports:
You can ignore this message as it does not effect the
ACS-1602’s operation.
The device you removed was not
properly put away. Data might
have been lost or damaged.
Before disconnecting a
device,you should select its
icon in the finder and choose
eject from the file menu.
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2003-04-22