How do I change what is shown between two displays? (Windows)
There may be times when you want the content shown on the built-in computer screen to be the same as what is shown on an external display (i.e. a TV, monitor or AV system). You may also want to show different content on each display. This document addresses both options.
If you would like to change the video output option on the Windows computer that you are using:
Hold down the Windows key (lower left corner of your keyboard, the key that has a square made of 4 smaller squares) and tap P as in Project. On your primary computer screen, you will be presented with 4 options. When the options list is displayed, you can release both keys. The list will remain displayed until you either select an option or click anywhere outside of the list, clicking outside of the list will is the equivalent of clicking Cancel. When the list of options is shown, you have several options to select a setting (Listed below). If you are making this change in a classroom, please be sure to change it back to Duplicate or reboot the computer when you are done with your class. This will put the room in the default setting for the next person using the room.
Computer video output options
PC Screen Only - This option will turn off the video feed to the external display (TV, monitor or AV system) and only show on your laptop
Duplicate - This will send the same visual to your laptop's built-in screen and the external display (TV, monitor or AV system). This is the default setting for all classrooms
Extend - This allows for the laptop built-in screen and the external display (TV, monitor or AV system) to show different content at the same time. This is used for PowerPoint notes on your laptop and the presentation on the external display.
Second Screen Only - This option will turn off the video feed to the laptop's built-in screen and only show content on the external display (TV, monitor or AV system) .
Options for selecting an option
Option 1 - Use the mouse and click the desired setting.
Option 2 - Use the up and down arrows and tap the Enter key when you have selected the desired option.
Option 3 - Tap the Windows Key + P combination again and the selected option will move to the next option down the list.
MAC OSX:
These steps require the computer and the External Display (i.e. TV, external monitor or AV System) to be connected and both device be active.
Steps:
Step 1 - In the top left corner of your screen, click the Apple
Step 2 - Select System Preferences
Step 3 - Select Displays
You will now be shown two windows, one window will allow you to adjust the visual settings on the laptop's built-in screen and the other will (by default) allow you to adjust the external display. Each window will have a drop-down list of connected displays. Unless you have changed the computer settings, the computer's screen will be identified as Built-in Display. The external display will be represented by either Display or the name of the device. A common name to be displayed if connected to a classroom AV system will be ExtronScalerD. ExtronScalerD is how all Classroom AV switches present themselves when connected to a computer.
Step 4 - In the window labeled Built-in Display, select the center tab labeled Arrangement
Step 5 - On the left side of the window towards the bottom (above the drop-down for AirPlay Display, you will find a checkbox labeled Mirror Displays.
When Mirror Displays is checked, the same content will be sent to the Mac's built-in display and the external display. If the box is unchecked, the two displays will show different content.
If you are making this change on a teaching station computer in a teaching environment, please be sure to either reboot the computer at the end of class or make sure that the Mirror Display option is Checked. This will ensure that the settings are in the default condition for the next person teaching in that space.