[my123]

Note that Windows Vista onwards has UMDF too (user-mode driver framework). NT6.0 was a very big step.

[repiret]

UMDF was available for XP too, and printer drivers had been user space for a long long time.

[blattimwind]

iirc you can have kernel-mode GDI printer drivers, and the printer port drivers are in the kernel as well

[my123]

I see, was a backport there