Well, apparently there will be a new member in the NT family, alongside with WinNT/ServerNT/LanmanNT/EmbeddedNT, there will be a new "PhoneNT", this is from the ntoskrnl.exe of Win8CP, and the string is a new addition since Win8DP.
Post subject: Re: “PhoneNT” seen in Win8CP, might be the 'Apollo' kernel Posted: Sun Mar 04, 2012 10:18 pm
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Well, in the earlier builds, before the project was officially renamed as Windows 8, back when it was still a post-RTM update to Windows 7 (even the Microsoft developers themselves didn't know where the project was going at the time, let alone how and where it would eventually end up), Microsoft was obviously still working on kernel updates, such as what is seen above, even though they still weren't quite sure what to do with the project otherwise, as far as the actual functionality was concerned.
What is shown running in the above live action screenshots appears to be a special setup, with just the command line interface running, although the Solitaire window screenshot seems to imply that they still had the Windows applets, or at least some of them anyway. It also appears that they were experimenting with some ideas (such as the use of the "Onscreen Keyboard" in the upper screenshot, and the user interface running in the background with the keypad buttons, including the "Dial" and "Save" buttons, shown in the lower screenshot) that would allow Windows to be easily used on a PDA/Smartphone or other such smaller footprint devices.