It is an object to form a conductive region in an insulating film without forming contact holes in the insulating film. or more in a step during manufacture, an external magnetic field is applied in the same direction as the direction of magnetization of this magnetic garnet film. The authentication module may include a processor for running a one-way hash algorithm. The request may include information identifying the user. The alert can include the employee’s name, the location of the employee, and the time heshe was supposed to call. Also, a voltage drop across each of the N input resistors may be equal to an input voltage of a corresponding input channel.