In other words, you can view alerts about missed calls, incoming messages, or other information on your computer without unlocking your phone. You can also dismiss notifications from your PC and they’ll automatically be dismissed from your Android device at the same time.
In order to take advantage of the new feature you’ll need a version of Cortana for Android from May 19th or later and you’ll need to be a member of the Windows Insider program, which lets you test new features before they’re more widely available.
If you meet those conditions, you can go into the Settings menu of Cortana and find a new section called Sync notifications that lets you choose which type of notifications you want to see on your computer.
In addition to missed calls and message notifications, you can enable support fro a low battery alert so that your computer will let you know when it’s time to plug in your phone (or turn on battery saving features if you don’t have a charging cable handy). There’s also an App notifications sync menu that lets you choose which of your Android apps can send notifications to your PC.