StarTech.com USB2DVIPRO - Manual (Page 11)

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Media Playback
Please note that while operating in Extended Mode, USB2DVIPRO can
display media files and DVDs using a broad variety of media players,
however in Clone Mode, limited support is available for video playback.
Mac OS X (10.4.11/10.5.6)
To configure the display settings and monitor positions, bring up the
Displays Preferences from the System Preferences menu:
The Display settings for each display will appear on the individual
monitors themselves. To configure them all from a single location,
press the “Gather Windows” button and each screen’s Displays
Preferences windows will appear on that display.
All supported video resolutions will appear in the list on the left side.
To change the positioning of each display, click on the “Arrangement“
button (found only on the primary display) and you can then virtually
reposition each display.
Using the Adapter in Extended or Mirror Mode
By default the USB2DVIPRO will be setup as an extended display. To
change the display as a mirrored/cloned display, check the “Mirror
Display” box on the “Arrangement” page for that monitors Displays
settings window. To return the monitor to an extended display, uncheck
this option.
To use both extended and mirrored displays simultaneously, turn off