Sony PCG-505F - Manual (Page 84)

VAIO 505 SuperSlim Notebook User Guide %
Selecting the Display Mode
When you connect an external display, you can toggle the display mode
between the LCD on your computer and an external display.
1
Click the Start button on the Windows 98 taskbar.
2
Point to Settings and click Control Panel.
3
Click Display.
4
Click the Settings tab.
5
Click the Advanced button.
6
Click the NeoMagic ® tab.
7
Click Display Options.
8
Select one of the options under Display Mode: