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I couldn't access the link to this, but using barcode and mag stripe readers in the past, I know that they are just meant as an easy input device. They really are just meant to read in the number (same as if you just typed it in with keyboard). That's all they do. You still have to have a frontend (usually a database app of some sort). That will allow you to perform various functions using the barcode that was read in. Just a convenience device to save you from having to type in every barcode number.
For what it's worth, this is the same way that a barcode works at a store as well (with a register).....it's just usually preconfigured in registers, only requiring a list of all products/prices/etc.
--deftech
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