  Scrolling mechanism is used to display and edit large documents in a limited
screen space or window. The scrolling mechanism may include a vertical scroll
bar or a horizontal scroll bar or both to move the contents of the documents up
and down or left and right. There may be navigation buttons on the screen
representing the navigation keys on the keyboard. The user can click these
buttons to scroll the screen.
  There may be very different methods of scrolling such as by using the
"thumb", as popularly used with a PDF document. Scrolling may be achieved
through eyeball tracking in a hands-free environment where the user does not
have hands or wants to use hands for other activities. This article illustrates
ten interesting inventions on scrolling selected from US patent database.
