In order for them to be useful, barcode scanners often have to be connected to computers. We will recall that in virtually all cases, the data which gives meaning to the barcodes they glance at is stored in databases, which are in turn hosted on computers. What the barcode scanners are meant to do, then, is to transmit the data they scan to the machine, with the machine checking that data against the database in order to assign meaning to it. In most cases, then, scanners without computers will tend to be quite useless. For a scanner to be useful, it has to be connected to the machine. And what we are interested in, for this analysis, is gaining an understanding of the ways through which barcode scanners connect to computers (at the simple, physical, external level). More information: Ninja Gaiden
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