At Build developer conference last year, Microsoft announced that they will be introducing a new Windows class that will allow developers to easily include multiple windows support in their UWP apps. After some delay, Microsoft has now finally released this support for developers.
The new window class is called AppWindow and all AppWindows you create run on the same UI thread from which you created them. You can start using these APIs if you are running Windows 10 SDK Preview Build 18327 or later. Learn more about this AppWindow from the source link below.
Working off of insider builds? We’re excited to announce the new Windowing APIs for #UWP! Build better multi-tasking with the ability to create multiple windows on a single thread :+1:Blog post with samples and more information here: https://t.co/oBGPNauQ0N pic.twitter.com/S5tXHdU8cA
— Windows UI (@WindowsUI) February 13, 2019
Source: Microsoft