An apparatus and method of using the apparatuse. The call flow server server, which may be implemented with either a single processor or multi-processor design, includes call flow engine and call flow thread manager modules capable of managing a plurality of call flow events by distributing the call flow scripts associated with such events among a plurality of threads executing on the call flow server. The support hook has a section which fits over the valance, a rear section which extends behind the valance and holds the support hook to the valance and a front section which extends in front of the valance and has a hook-like portion on the end thereof for holding a supplemental window decoration.