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Your device must be connected to the WiFi SOHO.
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Click the Airplay icon at the top right side of the menu bar.
Then click the name that matches the meeting room in which you are present.
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Enter the 4 digit “Cast Code” displayed on the TV/Projector.
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Settings regarding Airplay screen sharing, as well as the option to stop it, can be found by clicking the Airplay icon again.