A low-cost warm water heater for use in portable toilets, to provide unblended warm water for hand washing provides a small quantity of warm water at a predetermined temperature, the flow being sensibly at ambient pressure. In one embodiment, the system and method clusters groups of nodes into subnets. Various embodiments also allow various types of temporal overlapping and composite display techniques for viewing ads and video content. In a case where the task is performed in another region instead of the designated region, an interrupt signal is generated, which consequently enables determination or location of an application program with an error more quickly or accurately. First portions of the hinges are attached to the hatband and second portions of the hinges are attached to the mounts. The current bandwidth allocation requests stipulate current requested bandwidth amounts for multiple streams, and the current bandwidth allocation requests may be received from multiple entities having the multiple streams.