The Windows Subsystem for Linux, already available to those testing early builds of the OS under the Windows Insider Program, lets users run the Bash command line on top of various Linux-based operating systems.
Each of these Linux distros is available as an app in the Windows Store. Microsoft knows that many developers, especially web developers and system administrators, use operating systems and frameworks that run only or best on Linux systems and servers.
Microsoft's Windows 10 S installer functions in a similar way to the Windows 10 Update Assistant. Eye tracking has always been an option, but it's taken until now for it to get official native support in Windows.
So once you're using Build 16251, as the Window Blog explains, the sum total of changes is "Very Little!" apart from the fact that the word "BETA" will have disappeared in the Windows Features section.
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Late past year, Microsoft also explicitly cautioned Windows Subsystem for Linux users not to use it to alter Linux files because of file-system differences.
However, the commands and software supported by the WSL apps are still limited compared to running a full Linux install.
Additionally, now the beta is gone, any problems relating to the Linux distro are back in the hands of the distro management - Microsoft will only handle the WSL infrastructure.
Three years later (that is to say, last week), Satya Nadella used this year's hackathon as a venue to announce that eye tracking would soon be natively supported in Windows 10. The biggest challenge I have faced up until this point is simply getting all the hardware drivers installed because those executable files cannot be run on Windows 10 S either. While Microsoft's then CEO Steve Ballmer described open-source software as a cancer in 2001, in 2014 Microsoft CEO Satya Nadella proclaimed that "Microsoft loves Linux". Each has their advantages and disadvantages.