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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?

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    Do you mean Microsoft Windows by "Window"?
    – choroba
    Commented Jan 17, 2018 at 12:34
  • Yes I mean Microsoft window
    – coding_ninza
    Commented Jan 17, 2018 at 12:34

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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.

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