 McColough started the PARC (Palo Alto Research Center), meant to operate something like AT&T's Bell Labs.PARC researchers developed pioneering commercial products in the field of personal computers—such as the Alto personal computer, GUI (graphical user interface), the WYSIWYG (What You See Is What You Get) editor, the first commercial mouse, Ethernet network architecture, OOP (object-oriented programming), PDL (Page Description Language), Internet protocols, and laser printing.But McColough and Xerox have been criticized for failing to take advantage of the opportunities PARC provided.