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input devices 
Electronic devices used to transmit data and commands to a computer.
trackball
Device with a movable sphere on the upper part of its case; it directs the movements of the pointer on the screen.
digitizing pad
Input device equipped with a touch screen on which one can write, draw or point using a stylus.
stylus holder
stylus
Pencillike implement that is used to enter alphanumeric data, create and retouch images and select an option on a touch screen.
