Dell E5515H Monitor - Manual (Page 67)

Setting Up Your Monitor
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• Show desktop only on: Display the status of a particular monitor.
This option is typically chosen when the laptop is used as a PC so the
user can enjoy a large external monitor. Most current laptops support
mainstream resolutions. As shown in the figure above, the resolution
of the laptop monitor is only 1280 x 800, but after connecting a 27”
external LCD monitor, users can immediately improve their visual
enjoyment to 1920 x 1080 Full HD quality.
For Windows® 7