You can do this on your computer if you’re using Google Chrome. RELATED: Mirror Your Computer's Screen on Your TV With Google's Chromecast You don’t need to open the relevant app on your Roku first, either. As long as your Roku is on, it’ll appear in the list. Tap the same “Cast” button Chromecast users use, and you’ll see your Roku appear in the list of nearby devices. To use DIAL, open the Netflix or YouTube apps on your smartphone or tablet, or visit the Netflix or YouTube websites on your web browser.
In its original state, Google’s Chromecast actually used DIAL to cast videos, but now it uses a different protocol.
(Sadly, those built-in smart TV apps probably aren’t very good.) For example, modern smart TVs may also implement DIAL, allowing you to cast videos from Netflix and YouTube to the apps built into your smart TV. It’s not just for the Roku, but it’s designed to work on a wide variety of devices.
The Roku supports DIAL-short for “Discovery and Launch”-a protocol jointly developed by Netflix and YouTube. Start Watching Netflix or YouTube From Your Phone or Web Browser
