Redundant power supplies and redundant channels of communication maximize the probability that a controller will trigger a battery disconnect switch to open when commanded to do so. Each circuit block is subjected to a dynamic timing analysis, and a delay characteristic library including obtained analysis results is generated. The composition further includes Simmondsin. Once it has determined the availability of one or more participants in the communication session, the availability manager of the illustrative embodiment transmits one or more signals to a call-processing server, which then sets up the participants on the session via the appropriate communication medium such as voice, instant messaging, and so forth. The materials may be separated by melting the different layers one by one. When the telephone line is once again available for connecting to the server, the client uses the browsing information saved to reconnect to the Web page that was displayed by the client at the time of the disruption.