A patient support includes a layer of fluid pressurized bladders, the bladders each having a chamber and an upwardly facing surface for facing and supporting a patient, and a cover over the layer of fluid pressurized bladders. A first DAGC value is stored before reception of one or more enhanced pilot signals. An elongated wiring harness extends from the device being protected and through the bore of the protective shield. Thus, the service message can be transmitted to predetermined subscribers without requiring the subscriber to generate and transmit the specific network information to the service provider. The power supply device is able to determine and monitor standby power usage levels of the device so that when the control device detects that the connected electrical device are not being used power supply is removed from the device. The fragile compiler also records which properties of the external code entities were used to produce the optimized code in a \u201cfragile set\u201d, so that the virtual machine at which the compiled code is deployed and executed can detect if the recorded properties of the external code entities are compatible with the properties of the corresponding entities on the deployment virtual machine.