Broadcast to AppleTV
Simple instructions to Broadcast your iMac to the Apple TV
Did you know that you can broadcast anything on your computer to an Apple TV? This means that you can play DVDs and show them on your large screen TVs.
This is all possible via Apple's Airplay Mirroring. You can enable this in the System Preferences > Display and check the box next to "Show mirroring options in the menu bar when available."
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In order for this to work properly the computer and AppleTV have to be on the same WiFi network. So if you have multiple WiFi networks both devices have to be the same network.
It doesn't matter where in the house the two devices are. So you can play a movie from wherever your devices are.
To enable the Airplay, click on the status icon and select the Apple TV. When you're sharing the screen contains the icon in the toolbar turns blue.
You can set it up so that only music to the Apple TV. This is done via System Preferences > Sound. Select the Output and you should see the Apple TV there. Note: This applies to all audio from your computer, so the Slack notifications would play on the Apple TV
In the Safari app on your Mac, navigate to the web video you want to play. Compatible web videos have an AirPlay icon. Click the AirPlay icon, then select your Apple TV.