An angle adjustable camber assembly is adapted to support the wheel of a wheelchair having a seat, the rear of which is at a given rear seat height. The apparatus includes an arcuate rack gear positioned on the base, and an elongated adjustment mechanism associated with the handle portion. The temporal conditions include temporal fields having a time-based association with one or more other conditions of the respective queries. A first packet may have one or more labels configured to control routing of the first packet through the network and a payload to carry the information.