A mechanism is disclosed for storing one or more chunk-specific sets of executable instructions at one or more predetermined offsets within chunks of a chunked heap. A message in the radio signal is parsed to obtain a key. Providing approximation-function-parameter values for the collected, cache-efficiency-indicator values, an approximation function representing a relation between a cache-efficiency-indicator and the size of a respective cache fragment. The identification codes received at the service provider is compared for a match with the stored identification codes. Consequently, the mirror operation only mirrors data that would have been available for mirroring at the time the mirror request was received from the server. By carrying out predetermined operations, the keyless entry systems enters an adjustment mode wherein the detection distance can be changed by the detection distance setting circuit.