Disagree. Apple paid Xerox for the GUI (in shares) but then added a number of elements we consider an integral part of the GUI. Xerox had overlapping windows,

Disagree. Apple paid Xerox for the GUI (in shares) but then added a number of elements we consider an integral part of the GUI. Xerox had overlapping windows, a mouse, networking and Smalltalk. Apple lost the network and Smalltalk (later to reappear as Appletalk and Obj-C) but added icons, pull-down menus and the desktop metaphor.