The invention relates to a magneto-optical component, such as a variable light attenuator, light modulator or optical switch, having small size, low power consumption and high speed. A first server of multiple servers generates an authentication policy table by inserting into the authentication policy table an authentication policy of each server and setting a relative priority of each server in the authentication policy table of the first server in order of decreasing number of users registered in an authentication system of each server. Preferably, all the other files are managed according to a common default management protocol.