Techniques for configuring validation rules in a client-server architecture, and for enforcing such validation rules are provided. A conducting element is provided in the profiled element to connect the inner face electrically to the outer face between the lateral faces and all along the length of the profiled element. The second processing circuit encodes a frame obtained from the image capturing device, records the resultant encoded data in the recording medium at a recording position determined in prior recording processing, determines a recording position for the first processing circuit, and transmits the determined recording position to the first processing circuit. The storage device can have multiple storage chambers and associated ducts or nozzles, so that each dose of powder can be dispensed through a separate duct or nozzle.