It's not necessary but gives you a better out-of-browser experience.
You'll be given the option to install a CRD web app. Click Access my computer, then click Turn on under Set up remote access. Once you get to the main setup screen, you'll see two options: Access my computer and Share my screen. To get started, fire up your Windows PC and install the Chrome Remote Desktop extension (hereafter 'CRD') in the Chrome browser. Google's Chrome Remote Desktop is free, easy to set up and effective. For all intents and purposes, it's like you're sitting in front of your Windows machine - while you're in front of your Chromebook. The Windows PC runs a remote-connectivity app that stays active while you're away the Chromebook connects to that app and accesses the remote Windows desktop inside your browser, where you can run programs, update settings or whatever. If you've never tried this, it may sound odd - but it works quite well.
Chrome Remote Desktop lets you use the software on a Windows PC from a Chromebook.
