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...You can use it with an USB bar code reader.It´s in Spanish, but if you´re interested to take it in English, please send me an e-mail to o.fernandez@edu.uah.es. I have updated a new version that allows to have more than one computer, with a server where you insert the products and the other JAR File is to manage the purchases. It works using Java´s RMI.
Thanks for your attention.