A method for processing scanned code data, including a plurality of strings, to determine whether the scanned code data is part of a valid code begins by examining a first string of a first scanned code data. The system includes a pair of electrodes, a circuit, and an output. In one embodiment, at least one magnet is oriented substantially vertically on the slide mounting tool for magnetic coupling with the first section of the slide during installation of the section on edge against a vertical surface. A membrane that may comprise hydrophobic properties may be located within the aperture of the housing. In a medium that recordsplays back data including video data and control information, the control information includes information for accessing a specific portion of the video data.