It´s a control system that you can use in a market to control your inventory or to collect the money of your clients. It´s simple but efficent and it gives you a summary of all your sales. 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...