Remote Desktop Preview for Windows 10 lets you control a PC remotely through your phone

An update to the Remote Desktop Preview app should theoretically allow you to run any Windows 10 app via the Continuum function built into Windows 10 Mobile. Microsoft released version 844 of its Remote Desktop Preview app on Wednesday for Windows Phones. If you have a phone that supports Continuum—the Lumia 950 or Lumia 950XL, for example—you should be able to run a standard desktop app on a remote desktop, powered by your phone.
Let’s back up for a bit. Recall that Windows 10 Mobile includes a technology called Continuum, which is only found on Microsoft’s latest phones, the Lumia 950 and Lumia 950XL. When the phone is connected to the Microsoft Display Dock, Universal apps—and only Universal apps, such as Mail, or Edge, or Calendar—can be run from the phone onto an external monitor, filling the screen and providing a desktop-like
experience.
Why this matters: With Remote Desktop, users can run apps that are stored on a remote PC on a local machine—in this case, a Windows phone. Normally, this would force you to navigate a Windows 10 desktop view via the relatively tiny confines of a phone, pawing at the interface with a finger. But because Remote Desktop Preview is itself a Universal app, with Continuum and a Display Dock you can project that interface onto a monitor. It essentially reproduces working on a remote, home desktop PC on a monitor in front of you—all via your phone. 

How it works

Connecting via Remote Desktop can require a bit of fiddling. First off, the target PC you’re connecting to via your phone needs to run either Windows 10 Professional, Windows 10 Enterprise, or Windows 10 Business. You’ll also need to ensure your firewalls are configured appropriately, and that the target or remote PC is configured for remote access. (Microsoft has published a handy guide to walk you through the process.) 
Installing and configuring the RDP preview app on my phone took far longer than was probably necessary for experienced users, as I ran into issues where the phone app couldn’t find my remote PC. My firewall appeared to be the problem. Finally, though, it worked.
For fun, I tried loading a copy of Far Cry 3 I had installed on my remote PC. While I was able to navigate to the game itself and load it, it was unable to find a “suitable display resolution” and actually load—not the fault of the Microsoft app, but of the game itself. I then discovered I was missing that USB-C to USB-C cable that I needed to connect the Lumia 950 to the Display Dock. Doh!

 Otherwise, however, I was able to navigate across my remote desktop relatively smoothly, though I would have benefited greatly from an attached mouse.