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One system I'm familiar with uses a backoffice PC with a database. In a fast food environment the cash registers are repackaged PCs with a touchscreen. These are networked and receive the touchscreen contents from the backoffice machine. Card scanners are also tied into the network. In a typical restaurant environment (TGI Friday's is one customer) there are fewer cash register stations and they aren't repackaged for countertop use, but located in out-of-sight locations, with a touchscreen monitor.
Perhaps you could flirt up a TGI waitress and have a look, or talk to a manager or something. The company (I don't recall the name) is in Fort Worth. You might look them up and check out their sales information for some ideas on how these things are done.
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