What familiar device was invented by human-computer interface engineer Douglas Engelbart, creator of hypertext?
Purple Numbers Purple Numbers is a suite of tools that allows one to address paragraphs of HTML content. It was originally conceived by Douglas Engelbart for his creation of hypertext. The name comes from the faint, purple numbers at the end of each paragraph, which represent the link to that paragraph. The name was coined by Christina Engelbart, Doug's daughter.
Openbook (website) Openbook was a Facebook-specific search engine, built upon Facebook's publicly available API, which enabled one to search for specific texts on the walls of Facebook subscribers "en masse" which they had denoted, knowingly or unknowingly, as being available to "Everyone," i.e. to the Internet at large. Both an avowed parody of Facebook and an Internet privacy advocacy website, it was built by San Francisco website developers Will Moffat, Peter Burns and James Home within a few hours on May 12, 2010, and received nearly six million page views in its first two weeks on-line from over a million people in over two hundred countries. The website received extensive media attention from, among others, the Wall Street Journal, NPR and ABC News, including international coverage.