However, non-wheeled mice are still available. Scroll wheels are prevalent on modern computer mice and have become an integral part of the hardware interface. The wheel is often, but not always, engineered with detents to turn in discrete steps, rather than continuously as an analog axis, to allow the operator to more easily intuit how far they are scrolling. Some mice can scroll horizontally as well as vertically, using a tilting scroll-wheel, or additional wheel on a perpendicular axis located elsewhere on the mouse. On a mouse, the scroll-wheel can often also be used as a third mouse button by pressing down on it – a scroll button. In other configurations (sometimes called "natural scrolling") the effect is inverted. In a graphical user interface, the "upward" motion moves contents of the window downward (and the scrollbar thumb, if present, upward), and vice versa. Most often, rolling the upper side of the wheel away from your body is to scroll "upward" or "forward", and the reverse direction is to scroll "downward" or "backward".
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