Methods for monitoring scale deposition in a water-containing industrial process are disclosed. The Web server accesses a music piece playing time information database and searches the playing time corresponding to that music piece. Additionally, a multilayer wiring area is formed on circuit element area. Current is passed through the electrodes in bursts of preferably five sinusoidal pulses, wherein each pulse within a burst has a duration of preferably 200 microseconds, and bursts repeat at preferably at 15-50 bursts per second. At the authentication sub-system, the identifier is used for checking the credentials of the subscriber.