I feel like it's disingenuous to tack the "Linux" label on this when this particular Windows subsystem isn't using any Linux code (last I checked; maybe Windows is suddenly subject to the GPL and I just haven't noticed yet?). It's really the GNU userland - albeit compiled against Linux's API/ABI (IIRC) - running on Windows using a special compatibility layer, kind of like an inverse Wine (Water?). Since Linux itself isn't involved (again: unless Windows is now subject to the GPL), the more apt title here would be "Blurring the Lines Between GNU and Windows".<p>I tend to disagree with the hard-and-fast insistence on the use of "GNU/Linux" v. "Linux" (since not every "Linux" is a "GNU/Linux"), but this is one of the few cases where the "GNU" qualifier is undoubtedly warranted.