Sony PCG-GR250 - Manual (Page 92)

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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 the Start button and then point to Control Panel.
2 Click Display to access the Display Properties window.
3 Click the Settings tab, and then click the Advanced button. The “(Multiple
Monitors) and Mobility Radeon Properties” dialog box appears.
(Multiple Monitors) and Mobility Radeon Properties screen