A plug-in data carrier includes a processor, a program memory connected to the processor, and a dedicated memory connected to the processor. The dedicated memory is divided into a plurality of regions including a region for controlling and managing the operation of a transaction device, which is a device...http://www.google.de/patents/US5434395?utm_source=gb-gplus-sharePatent US5434395 - Method and device for effecting a transaction between a first and at least one second data carrier and carrier used for this purpose
