Polyphosphazene polymers having immunomodulating activity, and the biomedical use of such polyphosphazene polymers, in conjunction with an antigen or an immunogen are disclosed. One or more dust shields each includes one end detachably anchored to one of the end caps with such as one or more catches, and the other end detachably anchored to the other end cap with such as one or more latches or fingers, for detachably securing the dust shield to the end caps and the housing without additional fasteners. The viewer compares the published graphic with a hardcopy of the same graphic. By simplifying the operation of a wireless station, the amount of energy required to be used by each station may be reduced thereby maximizing the lifetime of the network.