I want to have a Sales Point System and i am finding Difficult to have a Barcode System.please somebody help me.........

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If you mean a barcode scanner, then each scanner will have its own communication protocol that you can talk to via serial port connection or some other means. You will need to read up on the technical specifications for the model you want to use. Often manufacturer's websites will have these documents.

No i need to know the process......happening?How its done and how i can implement

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