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2. Optical trackpad - Wikipedia

   en.wikipedia.org/wiki/Optical_trackpad

   An optical trackpad on a HTC Desire, here, the silver disc in the center of the physical navigation bar of other buttons below the screen. An optical trackpad is an input device based on an optical sensor, which detects the displacement of a finger that is moving on top of it. [1]

3. Pointing stick - Wikipedia

   en.wikipedia.org/wiki/Pointing_stick

   IBM sold a mouse with a pointing stick in the location where a scroll wheel is common now. A pointing stick on a mid-1990s-era Toshiba laptop. The two buttons below the keyboard act as a computer mouse: the top button is used for left-clicking while the bottom button is used for right-clicking.

4. Pen computing - Wikipedia

   en.wikipedia.org/wiki/Pen_computing

   Pen computing refers to any computer user-interface using a pen or stylus and tablet, over input devices such as a keyboard or a mouse.. Historically, pen computing (defined as a computer system employing a user-interface using a pointing device plus handwriting recognition as the primary means for interactive user input) predates the use of a mouse and graphical display by at least two ...

5. Pointing device - Wikipedia

   en.wikipedia.org/wiki/Pointing_device

   6D Axsotic 3D mouse. A light pen is a device similar to a touch screen, but uses a special light-sensitive pen instead of the finger, which allows for more accurate screen input. As the tip of the light pen makes contact with the screen, it sends a signal back to the computer containing the coordinates of the pixels at that point.

6. Stylus (computing) - Wikipedia

   en.wikipedia.org/wiki/Stylus_(computing)

   several styluses; (l to r) PalmPilot Professional, Fossil Wrist PDA, Nokia 770, Audiovox XV6600, HP Jornada 520, Sharp Zaurus 5500, Fujitsu Lifebook P-1032 In computing, a stylus (or stylus pen) is a small pen-shaped instrument whose tip position on a computer monitor can be detected.

7. Touchpad - Wikipedia

   en.wikipedia.org/wiki/Touchpad

   Closeup of a touchpad on an Acer CB5-311 laptop Closeup of a touchpad on a MacBook 2015 laptop. A touchpad or trackpad is a type of pointing device.Its largest component is a tactile sensor: an electronic device with a flat surface, that detects the motion and position of a user's fingers, and translates them to 2D motion, to control a pointer in a graphical user interface on a computer screen.