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is a keyboard that is represented by a series of buttons drawn  on a monitor or screen .

are useful because they can be more accessible than regular keyboards .
can be useful in security
consicious enviroment.

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Are  plastic credit cards style cards that differ from normal "dumb" magnetic stripe cards by having a higher storage capacity   and an embedded processor. The processor is powered on when the card is inserted into a smart card reader.

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are considered relayively secure, it is possible to purchase stripe writers to alter the data on such cards.This can be done to create a clone of an existing bank card which might be indistinguishable from a genuine card

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Uses lasers to shine light into a bar code label .The thickness of the lines and the soacing between the lines on the barcode determine the amont of reflrcted light . This is then interpreted as a number by the barcode scannner . Barcode are most  commonly used on intems in supermarkets but they also have other applications such as identifying pcakage that are sent by courier firms .

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Joystick are two common input devices use dby gamers player . There are many different configurations available that include a variety of bottons and features .

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Allows sound data to be input into the computer. Many laptops have microphones built in to them , and external microphones can also be used. Microphones are often used with video -conferencing and voice over IP software.

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Allow users to interact with computers using their hand or a specially designed pen called a stylus.

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Are common inout devices on laptops , where there is usually not enough space for a mouse . As well as moving the pointer by tracing their finger across the touch pad ,users can also use bars at the side to scroll text on teh sreen .Multi-touch pad alow more complex actions to be performed using several fingers.

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large ball which is fixed in place so that the user can spin it around , controlling a pointer on the screen.

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A typical computer mouse has two bottons and many also have a scroll wheel in the centre to perform tasks like scrolling through documentor web pages .

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Are useful in situations where the user needs to make a quick selection of choices. Often used in restaurants to enter the items a customer

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Items of hardware that allow  entry of information into the computer. some are designed especially to help users with disabilities use the computer , help to create equality of acces for these users.