A programmable memory circuit and a method for programming the same are disclosed. The first and the second optical path have a common section adjacent to the object. Power is applied to the overall system only when the input password is identical to a preset password, and the power is shut off if not. One or more existing event nodes within the event log may be identified as having possibly caused the received event. Calculating a number of instances each platform is associated with each configuration, and generating a data structure with a plurality of nodes and edges.