Techniques of organizing meetings are disclosed. More specifically, the present invention relates to a method and device for monitoring the frequency discrepancy between two signals in conjunction with at least one data signal so as to improve the accuracy and efficiency of a phase-locked loop. A license search module receives a request to issue a license from a home device through the transceiver module, searches for a corresponding formal license in a license storing module, and transmits the search result to both a license request module and a temporary license issuing module. Magnetic recording is performed by applying an AC electric field from the electrode while a DC magnetic field is applied to the recording area of the magnetic recording layer. Several flip-flops and exclusive OR circuits cooperate to achieve this function.