and forced the user to have to learn cryptic mnemonic codes to do anything useful with the system. The chord keyset, which complemented the modal nature of NLS, forced the user to learn a 5-bit binary code if they did not want to use the keyboard. Finally, with the arrival of the ARPA Network at SRI in 1969, the time-sharing technology that seemed practical with a small number of users became impractical over a distributed network; time-sharing was rapidly being replaced with individual minicomputers (and later microcomputers) and workstations. Attempts to port NLS to other hardware, such as the PDP-10 and later on the DECSYSTEM-20, were successful, but did nothing to spread NLS beyond SRI. Frustrated by the direction of Engelbart's "bootstrapping" crusade, many top SRI researchers left, with many ending up at the Xerox Palo Alto Research Center, taking the mouse idea with them. SRI sold NLS to Tymshare in 1977 and renamed it Augment. Tymshare was, in turn, sold to McDonnell Douglas in 1984. Some of the "full-interaction" paradigm lives on in different systems, including the Hyperwords add-on for Mozilla Firefox. The Hyperwords concept grew out of the Engelbart web-documentary Invisible Revolution. The aim of the project is to allow users to interact with all the words on the Web, not only the links. Hyperwords works through a simple hierarchical menu, but also gives users access to keyboard "phrases" in the spirit of NLS commands and features Views, which are inspired by the powerful NLS ViewSpecs. The Views allow the user to re-format web pages on the fly. Engelbart was on the Advisory Board of The Hyperwords Company from its inception in 2006 until his death in 2013. From 2005 through 2008, a volunteer group from the Computer History Museum attempted to restore the system. See also File Retrieval and Editing System (FRESS) ENQUIRE Notes References Further reading External links On the Doug Engelbart Institute website see especially the 1968 Demo resources page for links to the demo and to later panel discussions by participants in the demo; About NLS/Augment; Engelbart's Bibliography, Videography; and the Engelbart Archives Special Collections page. The original 1968 Demo as streaming RealVideo clips A high-resolution version of the 1968 Demo video HyperScope, a browser-based project to recreate and extend NLS/Augment Douglas Engelbart himself is involved in this project NLS documents at bitsavers.org OpenAugment, another now defunct NLS/Augment implementation Hypertext History of human–computer interaction