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.
Personal Information Display A Personal Information Display is any device that displays user-configured information, which can be a combination of static and dynamically-generated data. Unlike a full-blown computer, it is a small, simple Internet-connected device which consumes little power, runs silently, is highly reliable, and provides little or no opportunity for real-time user interaction.