... variants such as the trackball is well known with all PC users. * Scanner: A scanner can be used to scan graphical images and photographs, and software can then be used to edit or touch up the images. Scanners can also be used to read typed or hand-writtten documents and this can then be interpreted by using OCR software, which can then export it to a word processor or data file. Scanners can also be used to input large volumes of data on pre-printed forms such as credit card payments, where the customers account number and amount paid are printed at the bottom of the payment slip. * Web Cam: This transfers images onto the screen. In can be used via the internet for video conferencing or you can even pre-record messages and send them via E-mail. * Bar Code Reader: Bar codes appear on almost everything we buy, whether it is a ...

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