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@rlonstein @Edent I'm interested to hear this from somebody who has worked with the technology. I've only read about RFID and NFC. The impression I had was that it should be possible to have multiple cards for different purposes present and the reader could select which to communicate with.
That wasn't borne out by my experience however. I couldn't use my office badge if my Oyster card or Southeastern trains Key card was next to it in my card wallet.