Human-computer interaction (HCI) is the study of how people interact with computers and the extent to which computer design can facilitate successful interaction. A significant number of major corporations and academic institutions now study HCI; in fact, most advances in HCI research come out of corporate and academic usability labs. HCI research into the direct manipulation of graphical objects began around 1963 at the Massachusetts Institute of Technology (MIT), while corporate research didn't enter that specialty until a decade later. The first commercial products weren't available until 20 years after the initial HCI research began. The concept of the mouse as a graphical manipulation tool also began in the university research environment (Stanford Research Institute) in 1965; corporate labs joined in the research in 1970; and the first commercial product was available in 1980. The idea of hypertext was briefly investigated after the Second World War, but interest picked...