The exercise device of the present invention has a base having at least one frame member extending from the base. A pair of track dollies mounted beneath substantially parallel and distantly separated support trusses allow the entire load bearing highline itself to traverse X-axis space. The confidence level may be based on an indication of time passage between the user accessing the content on the other computing device and the identified use of the computing device. A network router configured in accordance with the method has a forwarding table comprising only forwarding table entries that are used. The additives generally comprise an iron oxide component and a glass component which is preferably free of lithium oxide.