What is the equivalent of "X window system" in Microsoft Windows?

Question

We all know Linux/Unix uses X window system for Graphical User Interface.

Can anyone tell me what system does MS Windows use for Graphical User Interface?

Do you mean Microsoft Windows by "Window"? – choroba Jan 17 '18 at 12:34 — choroba, Jan 17 '18 at 12:34
Yes I mean Microsoft window – coding_ninza Jan 17 '18 at 12:34 — coding_ninza, Jan 17 '18 at 12:34

score 5 · Accepted Answer · answered Jan 17 '18 at 13:59

Windows provides two libraries for applications: GDI and USER. GDI handles primitives for drawing to the screen ( or other devices, like printers ), and USER provides more high level features such as windows. In Windows NT 3.1-3.51, they were implemented in csrss.exe, then in NT 4 the implementation was moved to win32k.sys to avoid context switching when a program made those calls.

What is the equivalent of "X window system" in Microsoft Windows?

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