Likewise, if 2 drivers want to each drive 3 cars in a session (as my wife and I just did this afternoon), the software will track the results. If you have 10 drivers and 5 controllers (as we did here the night of the first test), the software will rotate through the ten drivers, giving each a chance to race all 5 cars associated with the 5 controllers.
So I've written my own RMS software (Windows) for Carrera digital, using the protocol information so generously provided by SFI member brumbaer at his My software includes some things I thought were lacking in X-Lap: You can automagically rotate cars or drivers in a session. I wasn't very happy with the X-Lap software that came with the PC unit.
