[douche]

Both, in my experience. The touch screen sometimes works with the keyboard attached, and sometimes doesn't. The keyboard often doesn't work if it has been disconnected without the old-school "splatter chicken blood and livers about" kind of computermancy.

Of course, the software is a mess, because nobody has bothered to build versions for RT in years, and none of the regular x86/x64 Windows software is compatible with RT.