A device capable of indicating access modes for an accessible memory card comprises an indicator and an interface electrically connected to a controller of the accessible memory card and to the indicator. In addition to the foregoing, other method aspects are described in the claims, drawings, and text forming a part of the present disclosure. Induction heating is carried out by the induction coil and induction receiver that presses against the wafer, the lamp envelope or both to hold the melting piece or pieces in contact. One panel is a \u201cretractable panel\u201d movable from an open position towards a closed position, the sliding panels being free to move in longitudinal translation along the guide device when the retractable panel is in the open position and being locked while being arranged longitudinally one after another when the retractable panel is in the closed position. The magnesium alloy vessel has a hollow interior cavity containing a working fluid, with a stable, protective layer formed on the inside wall of the vessel so as to establish non-corrosive compatibility with the working fluid.