It included a wheel that, when rotated, let you scroll through text with ease. That’s why the Intellimouse felt like such a big revelation. Scrollbars are handy and still in use today, but the act of finding the scrollbar on the screen and then clicking its arrows or clicking and dragging a bar slowed things down. Somewhere along the way, the scrollbar was born-a user-interface element that lets you move viewable text within a window-and it became the standard way that users scrolled through text for at least a decade. Since the invention of window-based software systems, there’s been a need to let people change what information is viewed in the window.
