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scroll bars
Scroll bars are horizontal or vertical bars that show both mouse and keyboard users how far into the file they've gone. You use these bars with a mouse to scroll the contents of the window.
  - Click the arrow at either end to scroll one line at a time. (Keep the
    mouse button pressed to scroll continuously.)
  - You can click the shaded area at either end of the scroll box to scroll
    the window one page (windowful) at a time.
  - You can drag the scroll box to any spot on the scroll bar to quickly
    move to a spot in the window relative to the position of the scroll box.

 
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