Sony PCG-R505JSP - Manual (Page 82)

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Selecting the Display Mode
This notebook uses the Intel® video controller, which enables you to select the
desired display 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.
To select the display mode
1 Click Start, then click Control Panel.
2 Click Display to access the Display Properties window.
✍
See “Connecting an External Display” for more information.