The subject disclosure pertains to an input system and method. At least one of these external elements is at least partially transparent or translucent. Optimally, an adhesive is deposited onto one of the surfaces for facilitating affixation of the disc to an insole or similar orthotic device. Measuring a respective current value on the data line while each of the at least three successive voltages is applied to the data line. The outer support can be in the shape of an open boot. Another benefit is that the service life of the heat source for the cathode is identical to the service life of the laser used.