If it was a computer that looks much like the normal info-desk computers, basically it is a computer that all it runs is the Borders eBook store/software.
The computer, for whatever reason, is locked down and you'll need an employee to punch in the super-secret password to get access to the computer.
Then you would log in with your Borders eBook account, search for books you'd like to purchase, purchase them using a credit card or gift card. Then you would just plug your reader into the USB cable at the desk, and click the Synch button to copy the new books to the reader.
(I work at a Borders, and this is the set up that we have. Other stores might have something different.)
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