A method and apparatus for determining a computer system usage profile, and transmitting the computer system usage profile to a server which targets content to the computer system in response to the usage profile is described. For example, when the operating system becomes unavailable, either because of failure or system upgrade, the PoE manager continues managing a power plane in the network device such that connected PDs continue to receive DC power. is adjustable by means of pressure equalization with the gas reservoir andor the ambient pressure. The memory unit stores a key code and a second transmitter in communication with the memory unit generates a key code carrying signal.