Sony PCG-GRX510P - Manual (Page 100)

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Selecting the Display Mode
This notebook uses the ATI video controller. You can select which display is used
when the notebook is connected to an external monitor. When you connect an
external display, you can switch the display mode between your notebook’s LCD
display and the external monitor.
1 Click Start, point to Control Panel, and click Appearance and Themes.
2 Click Display to access the Display Properties window.