https://wccftech.com/samsung-dex-companion-app-for-the-galaxy-note-10-now-live/

At the Galaxy Note 10 launch event, Samsung shed some light on the future of DeX. Until now,  Samsung DeX wouldn’t work without a bulky module that had to be purchased separately. Starting with the Galaxy Note 10, it is now possible to run DeX as a window on your desktop. All you need is a dedicated app on your desktop, and that’s rolling out, starting today. It is available for Windows and macOS.

To get started, simply connect your phone to your PC/Mac via a USB cable and launch the software. It has all the features of older versions of DeX and even allows you to easily transfer content from your computer to your phone. It is as simple as a drag and drops gesture from the host device to the destination. Oh, and there’s clipboard sharing too. DeX also lets you copy and paste text between your handset and desktop. The app also mirrors your phone’s notifications on your computer, which avoids having to switch from one device to the other. I’ve had a little hands-on with the app, and it’s been working well, for the most part.