A method of processing requests for resources in a system in which a plurality of content providers provide multiple resources. The first version includes the identities of items of information included in the database. The dispenser and the dispenser modules therein are configured to provide security against unauthorized access thereto. The calculated hash values are further concatenated using a hash function to generate data to which an digital signature is applied. The power management controller preferably disables the power supply when the AC voltage sense signal is de-asserted. The dust cap can be provided at a free end of the loop back device when the loop back device is secured to a tether connector.