A multi-junction solar cell having a Ge or GaAs substrate, as well as a solar cell structure having several subcells deposited on the substrate, the substrate having peripheral side faces, and the solar cell structure having a peripheral circumferential surface, which runs spaced apart from the side faces. The computer readable medium includes computer-executable instructions for execution by a processing system. The service processor is locked to provide the terminal sole access to service processor in response to receiving a request to provide a terminal sole access to access the service processor.