The presentation of user interface content via a media player is disclosed. An engine driven air pumping device draws ambient air, or alternately exhaust gas through the pump inlet, compresses the air, and delivers the compressed air through the pump outlet to the turbocharger compressor inlet or alternately the turbocharger compressor outlet. Each source array LUN corresponds to a virtual array LUN and equals the storage capacity of that corresponding LUN. Authentication and access restrictions are dynamically enforced against the requests made by the principal before a connection is permitted between the principal and the resource. In some cases, the first voltage can be a periodic wave such that the higher voltage is produced with one portion of the level shift device during a first portion of the wave and another portion of the level shift device during a second portion of the wave.