The system has a computer terminal (1) e.g. laptop, and a non-volatile pocket card (3) i.e. credit card, which is detachably connected to the computer terminal and provided with a non-volatile memory. A server (6) is provided remote from the computer terminal, where the server includes two sets of data. A user interface (7) is provided on the computer terminal based on information stored in the pocket card. The user interface allows an owner to access one set of data, and allows or denies downloading of another set of data in the pocket card. An independent claim is also included for an interactive data management method.
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