A 3-D spiral stacked inductor is provided having a substrate with a plurality of turns in a plurality of levels wherein the number of levels increases from an inner turn to the outer turn of the inductor. A user’s expressed interest in a particular portion of a requested page and hisher requests for additional information relating to the particular portion are tracked. The additional reflections reduce or eliminate the reflections from the absorptive layer by destructive interference. When the stylus is inserted into the containing slot, the switch is pressed by the stylus. Corresponding system and computer program product are also provided. The polycrystalline silicon ingot producing apparatus includes: a crucible for melting silicon; conveying shafts for adjusting the height of the crucible; heaters for heating the crucible; and a cooling plate located below the crucible for cooling the crucible.