What complicates this further is with GDI (from Wikipedia/Architecture_of_Windows_NT) > The Graphics Device Interface is responsible for tasks such as drawing

What complicates this further is with GDI (from Wikipedia/Architecture_of_Windows_NT) > The Graphics Device Interface is responsible for tasks such as drawing lines and curves, rendering fonts and handling palettes. The Windows NT 3.x series of releases had placed the GDI component in the user-mode Client/Server Runtime Subsystem, but this was moved into kernel mode with Windows NT 4.0 to improve graphics performance. I remember how rock solid NT 3.51 was, then NT 4.0 and early Win 2000 was a period of less stability especially on laptops until it finally got stable again.