IOGear GUC2015V - Manual (Page 12)

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Note:
When in
Extended Mode, you will see the
wallpaper displaying on the monitor/display that is
connected to the USB External VGA Video Card
or USB External DVI Video Card.
Click on the monitor icon to bring up the 3.
configuration menu. When connecting
the USB External VGA Video Card or USB
External DVI Video Card to your computer, it is
configured to function as the Extended Mode
by default, and you can also change to Mirror
mode as you prefer.