The invention relates to luminophores having semiconducting properties and to the production and use thereof in organic luminous diodes and organic solar cells. The joining means comprise a rear joining support, a stop opposite the joining support on the other side of the disk, and pressure means which join the stop to the rear joining support, with the disk and part of the end of the crusher lying there between. The projections allow a logistics provider to determine when parts shortages are likely to occur and the nature of the potential shortages. The first contact plane abuts a bottom wall of a first one of a pair of stacked items. The programming defines the location of each note reference adjacent to a respective fret and under the respective string. When the portable computer is opened, the multimedia device may be turned to a use position.