A projector is a machine that shines a reflection of an image or text onto the surface in front of it. Example: The music teacher shone the song lyrics.

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A projector is a machine that shines a reflection of an image or text onto the surface in front of it. Example: The music teacher shone the song lyrics onto the wall for the children to see via the projector Projector

Joy Stick A lever that moves in all directions and controls the movement of a pointer or some other display symbol. A joystick is similar to a mouse, except that with a mouse the cursor stops moving as soon as you stop moving the mouse. With a joystick, the pointer continues moving in the direction the joystick is pointing. To stop the pointer, you must return the joystick to its upright position. Most joysticks include two buttons called triggers.pointermouse cursorbuttons Joysticks are used mostly for computer games, but they are also used occasionally for CAD/CAM systems and other applications.computer CAD/CAMsystemsapplications

Touch-Screen A type of display screen that has a touch-sensitive transparent panel covering the screen. Instead of using a pointing device such as a mouse or light pen, you can use your finger to point directly to objects on the screen.display screenpointing devicemouselight pen objects Although touch screens provide a natural interface for computer novices, they are unsatisfactory for most applications because the finger is such a relatively large object. It is impossible to point accurately to small areas of the screen. In addition, most users find touch screens tiring to the arms after long use.interfacecomputerapplications