Samsung Q45c - Manual (Page 63)

Using Dual View
Dual View enables users to expand their computer screen
over two display devices.
Dual View is convenient when a wide operating space is
needed. In addition, since Dual View operates as if there
are 2 graphic cards present even when there is only one,
you can set the resolution and color for each display
device.
Selecting Dual View
Check if the external display device is properly connected
and follow the instructions below.
1
Click the Start > Control Panel > Appearance and
Personalization > Adjust screen resolution.
2
Click on the number 2 monitor icon and select
Extend the desktop onto this monitor. Click Apply
and then click the
OK button.