A system and method for enabling verification of billing data received from an operator of a network resource access gateway by a billing service provider. Such compounds possess both muscarinic receptor antagonist and \u03b22 adrenergic receptor agonist activities. The method further comprises the step of electing the candidate supervisor as the new supervisor when all members on the HR subnet respond to the inquiry message. An optical component is formed or affixed at the front surface of the substrate. If necessary, the wafer portion on which the devices are fabricated may be thinned.