A keyboard is an input-output unit that is supported by the operating system. The functions supported depend on the design and usefulness of the keyboard.
Typically, a keyboard supports alpha-numeric keystrokes. In addition, some keyboards also include a numeric keypad with special keys indicating addition and subtraction.
Most keyboards also contain up to 12 function keys, each with a special purpose, depending on the operating system and other software application that is in use by the keyboard operator.
Some keyboards also include a mouse-like feature, sometimes called a 'pencil eraser'.
Depending on software, keystroke combinations can also invoke special actions.
Output to a keyboard may be limited to feedback sounds or lights.
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