An improved configuration for a programmable logic device and an improved method for configuration of a programmable logic device are provided. Light-controlled electrokinetic assembly of particles near surfaces relies on the combination of three functional elements: the AC electric field-induced assembly of planar aggregates; the patterning of the electrolytesilicon oxidesilicon interface to exert spatial control over the assembly process; and the real-time control of the assembly process via external illumination. The file system watcher monitors each object for events affecting the object or the object’s constituent files, such as creation, deletion, change and rename.