A control management system provides a plurality of software controllable devices coupled to a network wherein each device has at least one property to be controlled and a plurality of clients for changing the properties of at least one device. In the silicon wafer, oxygen precipitates, which act as intrinsic gettering sites, show vertical distribution. A switching path is between each throw terminal and the single pole terminal, and between each shunt terminal and the single pole terminal. The images are then aligned, transformed back to the spatial domain, and subtracted. A photo diode is used to monitor the emitted light intensity.