A network caching system has a multi-protocol caching filer coupled to an origin server to provide storage virtualization of data served by the filer in response to data access requests issued by multi-protocol clients over a computer network. In one embodiment, the fuel cell stack employs internal actuators that selectively close the inlet end of every other flow channel and the outlet end of every other opposite flow channel to provide the interdigitated flow. The method further comprises accepting and verifying credentials associated with the signed and encrypted data from the server utilizing the public key from the server. A side edge sensor of a finisher disposed downstream of the stacker detects a lateral shift amount of a sheet conveyed into the finisher. The provision of a second, selective list of addresses allows a user to access a favourite network address without scrolling through large numbers of bookmarks. The opening is located in the rear space such that the accommodation space is not exposed to the outside of the main body.