Nvidia GeForce 8400GS - Manual (Page 6)

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4. In the following window you can select between the same content on both displays (Clone) -> 1
or independent content to two displays (Dualview) -> 2 by using the extended desktop:
5. Select the second monitor / TV:
6. Did you decide for independent content on two displays (Dualview) -> 2 (see above) you need to
decide in the following dialogue box which monitor/TV will be the primary display.
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