A conductive layer having a plurality dimples is provided for interconnecting a power device chip and a driver circuit for driving and controlling the power device chip within a power module. A vacuum cleaner system for a portable vacuum cleaner having a propane fuel source, a sealed vacuum chamber and a total weight of not more than forty pounds, and having and at least one removably attachable harness, at least one removably attachable carrier shoulder strap, at least one removably attachable handle, at least one removably attachable wheel andor at least one rolling tray. Differential responsivity exists at two levels; bacteriorhodopsin proteins respond differentially upon exposure of a target chemical, and the response pattern exhibited by the proteins differs from chemical to chemical. Accordingly, a party may identify those software packages deemed invasive, and may optionally provide a solution to either defeat or monitor them, where practicable. An opposing distal end of the cylinder includes a compressed air inlet and an air release. A unique identification code for identification of the first handheld terminal or the second hand-held terminal is provided in at least one of the first hand-held terminal and the second hand-held terminal.