How do I keep my flipchart displayed on my Promethean board and do something else?

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How do I keep my flipchart displayed on my Promethean board and take attendance?

There is a freeze button on the remote. Click once to freeze what is being displayed this will allow you to do other things on your computer without it being displayed on the Promethean board. When you are ready to display your computer screen again, click the freeze button again. The display on your computer will be shown.