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2. Light pen - Wikipedia

   en.wikipedia.org/wiki/Light_pen

   A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.

3. Pointing device - Wikipedia

   en.wikipedia.org/wiki/Pointing_device

   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. It can be used to draw on the ...

4. Touchscreen - Wikipedia

   en.wikipedia.org/wiki/Touchscreen

   A touchscreen (or touch screen) is a type of display that can detect touch input from a user. It consists of both an input device (a touch panel) and an output device (a visual display). The touch panel is typically layered on the top of the electronic visual display of a device.

5. 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.

6. Input device - Wikipedia

   en.wikipedia.org/wiki/Input_device

   Touchscreens and light pens involve direct input. Examples involving indirect input include the mouse and trackball. [3] Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g., with a mouse that can be lifted and repositioned)

7. 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 ...