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there is no "all" key on the keyboard
The keyboard's function is to make it faster to send commands to the computer. These commands usually are for typing, but may include other functions.
The main function of a keyboard is to input data to the computer.
keyboard perfom input output operations in the computer
There are 107 keys in a full-sized computer keyboard.
From ProcessLibrary.com - kbdus.dll library file contains functions for the US keyboard layout.
For Keyboard functions follow this link: http://msdn.microsoft.com/en-us/library/ms907593.aspx For Keyboard picture follow this link: http://www.unotron.com/US/images/keyboard_plan2.jpg
An alt key is a key on a computer keyboard which is used to alter the functions of certain other keys.
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The full name of the computer keyboard is the Alphanumeric Keyboard.