Initial Developments
Early dynamic information devices such as radar displays, where input devices were used for direct control of computer-created data, set the basis for later improvements of graphical interfaces. Some early cathode-ray-tube (CRT) screens used a lightpen, rather than a mouse, as the pointing device.
The concept of a multi-panel windowing system was introduced by the first real-time graphic display systems for computers: the SAGE Project and Ivan Sutherland's Sketchpad.
Read more about this topic: History Of The Graphical User Interface
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