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A text input device, for example a computer keyboard is used to enter text or character information into an electronic system such as a notebook computer. Text, or character, input by users of electronic devices is a key technology for communication. Devices such as computers, mobile phones, smartphones need some way to input text characters with speed and accuracy. Virtually all software needs some kind of text handling capability. Email, messaging (SMS, social networking), word processing are just a few examples.
Computers have needed Human interface devices. Brief history of writing and the invention of printing.
Typing and Finger Entry Method
Typing is an important entry menthod. Fingers..keyboard musical..pressing letters into clay..
don't for get references 
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