Precursors[edit]
A precursor to GUIs was invented by researchers at the Stanford Research Institute, led by Douglas Engelbart. They developed the use of text-based hyperlinks manipulated with a mouse for the On-Line System (NLS). The concept of hyperlinks was further refined and extended to graphics by researchers at Xerox PARC and specifically Alan Kay, who went beyond text-based hyperlinks and used a GUI as the primary interface for the Xerox Alto computer, released in 1973. Most modern general-purpose GUIs are derived from this system.
Ivan Sutherland developed a pointer-based system called the Sketchpad in 1963. It used a light-pen to guide the creation and manipulation of objects in engineering drawings.
Part Four : Content3
Part Five : Summary