A multivalued memory has data of state \u201c0\u201d, state \u201c1\u201d, state \u201c2\u201d, and state \u201c3\u201d whose threshold voltages increase in that order. The administration system also includes a Work Force and Administration-Control subsystem that is configured to manage repair services that are performed on the PSTN in response to the customer trouble tickets. The first customer is then offered an opportunity to monitor the ongoing communication, and in some embodiments is connected to the ongoing communication. The virtual file system is configured to mimic characteristics of a host file system. The trailing portion provides strength and buttresses the cutting edge.