Acer 505 series - Manual (Page 65)

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External monitor
To show graphical effects on a larger display, connect an external monitor to the
CRT port. Read the monitor manual for additional instructions.
Note: If an external monitor is not connected, closing the display cover puts
the computer into Standby mode.
Using simultaneous display
Your computer takes advantage of Windows 98 multi-display capability, allowing
you to use your computer for presentation purposes. So whatever is displayed in
your computer will likewise be displayed on the other output display.
To use simultaneous display, you can choose to connect other output display
devices to the computer through the CRT port.
Enabling simultaneous display
To enable and set simultaneous display options, follow these steps:
1. Click on Start, Program, then Notebook Manager.
2. Click on Notebook Manager.
3. Click on the Display Device tab.
4. Click on Both under the Boot Display Device.
5. Click on Both under the Switching Display Device.
6. Click on OK.