A system, method, and computer program product for providing a user with a virtual environment in which the user can perform guided activities and receive feedback are described. The complexes have the formula MYnZ, where n is 1, 2, or 3; M is a metal in a +2, +3, or +4 oxidation state, Y is selected from an 8-hydroxyquinolate and a substituted 8-hydroxyquinolate, and Z is a phenolate. An off-host processing system in the off-host authentication system is coupled to the host processing system and is coupled to the authentication IHS through the network. Coordinate indicia is provided on the component carriage and reference indicia is provided on the locator plate. An airstream heat exchanger is provided connected in one of the supply and return systems so as to have the common working fluid conveyed therethrough cooled at selectively variable rates in the airstreams passing thereby during at least some such uses of the operating equipment. A composition of matter for chemically modifying a nonwoven textile article to achieve pilling resistance, soil release, strength, and abrasion resistance is also provided.