All kernel are based off one another. The NT kernel was derived from the 9X kernel. All the kernel are composed of aspects from the previous OS and used before. Vista is the 6th generation of the Kernel Microsoft has used.
Being as such you can not classify XP as a NT based system because it was not intended for Server use which is what the NT based system were for. Windows 7 the next generation is supposed to be the first line of Windows OS to have a completely new Kernel using the MinWin Kernel.
So in that aspect that you are talking Mr.Coffee NT is 9X based as that kernel used in 2000 was previously used in ME and 98 as well. The kernel goes as far back as Windows 3.1 and before.
So to classify XP as NT is to say that NT is 9X and so on.
A Windows OS in not specifically classified by its Kernel. It is more based on what it can do.
