j5 create JUD500 USB 3.0 Ultra Station - Manual (Page 27)

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Primary Mode
When Primary is selected, the display device
will become the main display. The display of
the internal graphics card will automatically
switch to be the extended display and act
as an extension desktop. Off
When Off is selected it will disable the
display of the ULTRA STATION.
Identify Monitors
When Identify Monitors is selected, a
serial number will be shown at the
upper right corner of the attached
display devices.
You can use the Hotkey function to find
out the serial number of each display.