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  Window Server
The window server manages the window on the display device. The application can use the window server to make the GUI and graphical interface. All the window is consist of the widget units. The widget is managed by the widget procedure supported by window server and is displayed on the screen by using the widget drawing fuctions and graphic library.
Window management support.
Standard window API support.
Drawing function call to display device.
The input device is connected to the thread
The graphic library and the window server is seperated.
User defined graphic library can be added.
The hardware dependent part is implemented in SDI (screen device drvier).