Every time it needed to process a credit card, it would use a telephone modem to log into the bank.

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To upload the data to a computer, a patient holds a small wand over his chest that picks up the data and transmits it through a modem to a Medtronic computer bank. (Future versions will be totally automatic and transmit wirelessly.) For now doctors mostly use the device to perform routine checkups remotely or to evaluate the device after it fires up.

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