A prefetch unit for use with a cache subsystem. When a user touches a monitor, which is implemented with the polarizing device, by hisher finger, the coordinate of the touch point will be detected by monitoring the interference caused on the equivalently generated electric filed. The method topically applies a composition containing a therapeutically effective amount of 2,3-dihydroxypropyl dodecanoate to the skin. The derived signal is attenuated based on the determination.