Virtual desktops, not machines. That being said, those have been in Windows since at least NT4 as a feature of the window manager and plenty of implementations that use other mechanisms to work around the drawbacks of the native method (e.g. being able to move windows between desktops).

Do you know that Powershell is something they had to make to have something ti compete with native Shell, right?

This isn't a native feature for Windows and they have to monkey patch it.

If you have used anyother OS, you will find out that Windows is fundamentally broken.