A small-sized and lightweight pointing device and receiving unit reduce power consumption. The switch includes an Optical Cross-Connect having F input ports and N output ports. The secondary scanning process may utilizes dual energy scanning andor high resolution scanning to resolve threats based upon the nature of the threat. Selection of a particular path for the clock signal is made by activating electrically controlled switches which themselves are activated or deactivated by software programs that run during power-up of the computer system that determine required phase lag or time delay of those clock signals as a function of parasitic capacitance in the computer system. The supplementary absorbent batt structure has a proximal end portion thereof joined to the front waist region of the basic absorbent batt structure and has the vicinity of a distal end portion thereof joined to the vicinities of the barrier cuffs.