Computer keyboard

From Wikipedia, the chargeless encyclopedia
This COMMODITY includes a account of references, but its sources abide cryptic because it has bereft inline citations. Please advice to advance this commodity by introducing added absolute citations. (February 2013)

Typing on a computer keyboard. See also: Movie of the accounting process.
In computing, a keyboard is a typewriter-style device, which uses an adjustment of buttons or keys, to act as automated levers or cyberbanking switches. Following the abatement of bite cards and cardboard tape, alternation via teleprinter-style keyboards became the capital ascribe accessory for computers.
A keyboard about has characters engraved or printed on the keys and anniversary columnist of a key about corresponds to a individual accounting symbol. However, to aftermath some symbols requires acute and captivation several keys accompanying or in sequence. While a lot of keyboard keys aftermath letters, numbers or signs (characters), added keys or accompanying key presses can aftermath accomplishments or assassinate computer commands.
Despite the development of addition ascribe devices, such as the mouse, touchscreen, pen devices, appearance acceptance and articulation recognition, the keyboard charcoal the a lot of frequently acclimated accessory for absolute (human) ascribe of alphanumeric abstracts into computers.
In accustomed usage, the keyboard is acclimated to blazon argument and numbers into a chat processor, argument editor or added programs. In a avant-garde computer, the estimation of key presses is about larboard to the software. A computer keyboard distinguishes anniversary concrete key from every added and letters all key presses to the authoritative software. Keyboards are aswell acclimated for computer gaming, either with approved keyboards or by application keyboards with appropriate gaming features, which can accelerate frequently acclimated keystroke combinations. A keyboard is aswell acclimated to accord commands to the operating arrangement of a computer, such as Windows' Control-Alt-Delete combination, which brings up a assignment window or shuts down the machine. A command-line interface is a blazon of user interface operated absolutely through a keyboard, or addition accessory accomplishing the job of one.
Contents [hide]
1 History
2 Keyboard types
2.1 Standard
2.2 Laptop-size
2.3 Handheld
2.4 Thumb-sized
3 Non-standard blueprint and special-use types
3.1 Chorded
3.2 Software
3.3 Projection (as by laser)
3.4 Optical keyboard technology
4 Layout
4.1 Alphabetic
4.2 Key types
4.2.1 Alphanumeric
4.2.2 Modifier keys
4.2.3 Cursor keys
4.2.4 Arrangement commands
4.2.5 Miscellaneous
4.3 Numeric keys
4.3.1 Multiple layouts
4.3.2 Blueprint alteration software
5 Illumination
6 Technology
6.1 Key switches
6.2 Control processor
6.3 Connection types
7 Addition text-entering methods
8 Added issues
8.1 Keystroke logging
8.2 Concrete injury
8.3 Bacteria
9 See also
10 Notes and references
11 External links