A Zone Control service is disclosed which provides for hierarchically managing a plurality of networked media subsystems. A short standard is connected between each of the signal conductors and the ground conductor at least three points in the longitudinal direction of each of the signal conductors, and an electrical characteristic is measured. The interface is configured to receive a speech card of a user, wherein the speech card of the user includes speech training data of the user and domain vocabulary for applications of the building management system for which the user is authorized. An inflatable element carried on the tubing may be inflated with a fluid carried in the tubing and forced into the inflatable element during expansion of the tubing. The resulting media stream may then be provided to the client presentation device. Upon impact of the axe with an object, the particles suddenly shift forward to intensify the impact of the axe and to reduce the recoil of the axe.