Reference Manual
Page 61
... to de-activate port Acer Ctrl-Alt-Esc (for Ctrl-Alt-Esc (for details on their external video port when a secondary display device such as a projector is connected. Refer to the computer's documentation for the appropriate command.) On some laptops, the activation function key is not listed or the given command... commands for some laptop computers are listed in the following table. (If your computer is labeled with an icon, for example or the text CRT/LCD.
... to de-activate port Acer Ctrl-Alt-Esc (for Ctrl-Alt-Esc (for details on their external video port when a secondary display device such as a projector is connected. Refer to the computer's documentation for the appropriate command.) On some laptops, the activation function key is not listed or the given command... commands for some laptop computers are listed in the following table. (If your computer is labeled with an icon, for example or the text CRT/LCD.