A brush wherein the bristles are retractable to facilitate the cleaning thereof in an efficient and effective manner. New andor substitute feature, content, andor functionality can be provided to application instance windows or applications that use flash player technology. Cables and lines can lead into and out of the closed cable channel through the openings without having to produce openings on the profiled member or the cover by means of mechanical processing. The methods described may apply to both masks and direct writing on other workpieces having similarly small features, such as semiconductor, cryogenic, magnetic and optical microdevices.