Observers say that it will mean you can download any old Win32 app from the internet, install it, and run it on a computer running Windows 10 ARM.

Windows 10 S will run on devices with ARM or x86 processors, but only supports Windows Store apps. Windows 10 ARM will run supports apps from any source and developers don't need to convert their software in any way.

It is all managed through a built-in emulation layer that allows Win32 apps to run on an ARM-powered system.

Vole demonstrated how you could download a common program like 7zip from the internet and simply install it on a device with a Qualcomm Snapdragon 835 processor.

Developers can also package software optimized for ARM as Universal Windows Platform apps for distribution in the Windows Store but it is now optional.