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The core section of a keyboard comprises character keys, which can be used to type letters and other characters.Typically, there are three rows of keys for typing letters and punctuation, an upper row for typing digits and special symbols, and the The MIT "space-cadet keyboard", an early keyboard with a large number of modifier keys.It was equipped with four keys for bucky bits ("control", "meta", "hyper", and "super"); and three shift keys, called "shift", "top", and "front".

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Typically, a modifier key is held down while another key is struck.

To facilitate this, modifier keys usually come in pairs, one functionally identical key for each hand, so holding a modifier key with one hand leaves the other hand free to strike another key.

An alphanumeric key labeled with only a single letter (usually the capital form) can generally be struck to type either a lower case or capital letter, the latter requiring the simultaneous holding of the key is also used to type the upper of two symbols engraved on a given key, the lower being typed without using the modifier key.

A keyboard layout is any specific mechanical, visual, or functional arrangement of the keys, legends, or key-meaning associations (respectively) of a computer, typewriter, or other typographic keyboard.

Most computer keyboards are designed to send scancodes to the operating system, rather than directly sending characters.

From there, the series of scancodes is converted into a character stream by keyboard layout software.

This allows a physical keyboard to be dynamically mapped to any number of layouts without switching hardware components – merely by changing the software that interprets the keystrokes.

It is usually possible for an advanced user to change keyboard operation, and third-party software is available to modify or extend keyboard functionality.

A computer keyboard comprises alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, navigation keys for moving the text cursor on the screen, function keys and system command keys – such as – for special actions, and often a numeric keypad to facilitate calculations.

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