A method for creating, with an unset radio control provided with a NFC device, an adjunct rolling code radio control controlling a user device, with which an original radio control is already associated having a rolling code based on a variation algorithm unknown by the unset radio control, wherein includes identifying the algorithm via a sniffer provided with a NFC device. If the sniffer possesses the algorithm, then the algorithm is transmitted via NFC from the sniffer to the unset radio control; if instead the sniffer does not possess the algorithm, it acquires the algorithm with an apparatus connectable to the internet and provided with a NFC device, then transmits the algorithm via NFC from the apparatus to the unset radio control. The original and the unset radio control are simultaneously activated such that the original radio control can set up the unset radio control based on the algorithm.