Asus M51BC User Manual page 46

On Windows
Duplicate these displays: Select this option to use the additional monitor as a
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duplicate of your main display.
Extend these displays: Select this option to use the additional monitor as an
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extension display. This increases your desktop space.
Show desktop only on 1 / 2: Select this option to show desktop only on monitor 1
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or monitor .
Click Apply or OK. Then click Keep Changes on the confirmation message.
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Chapter 4: Connecting devices to your computer