However, differences between national layouts are mostly due to different selections and placements of symbols on the character keys.The core section of a keyboard comprises character keys, which can be used to type letters and other characters.
The English alphanumeric keyboard has a dedicated key for each of the letters A–Z, along with keys for punctuation and other symbols.
In many other languages there are additional letters (often with diacritics) or symbols, which also need to be available on the keyboard.
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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.
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".
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.
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