Presented here is a method of operating video services receivers in a network that includes a controller device and at least one member device. The first circuit may be configured to generate an output signal in response to an intermediate signal. A query message is received by the signal transfer point, a first database residing in the signal transfer point is accessed to determine the location of a second database also residing in the signal transfer point for processing the query message. The system includes a search engine that generates a query search result based on a query and generates a suggestion search result based on each suggestion phrase in the set of initial suggestion phrases. Deletion processing is done of one coupled node tree, taking as the processing source in the above-noted splitting method, and insertion processing is done of the other, taken as the processing target, thereby conjoining the coupled node trees. Air flow within the oven is managed using sets of adjustable baffle plates above and below the conveyor belt.