In a satellite receiving system, program channels are selected from one or more broadband signals and combined with other selected channels and transmitted from a first unit, for example an outdoor unit, to a second unit, for example a gateway, server, or set-top box, using a single cable. An oxidant and fuel flow network are provided having an input portion for supplying reagent and an output portion for removing reagent after electrochemical reaction. In response to a working memory action involving a particular object type, the rule engine may check a truth maintenance parameter of the object type involved to determine if truth maintenance for the object type has to be enabled. The mating tube is inserted into an aperture in the wall of the fluid distribution conduit, and provides a fluid tight joining method.