NoteCards was a hypertext-based personal knowledge base system developed at Xerox PARC by Randall Trigg, Frank Halasz and Thomas Moran in 1984.[1][2] NoteCards was developed after Trigg's pioneering 1983 Ph.D. thesis on hypertext while at the University of Maryland College Park.Each notecard contains an arbitrary amount of information embodied in text, graphics, images, or some other editable substance.One interesting feature of NoteCards is that authors may use LISP commands to customize or create entirely new node types.NoteCards was available commercially from the Common Lisp software vendor Venue,[4] compiled for Solaris 2.5 and 7 (untested on later versions) and Linux x86 with the X Window System.