A heat-sensitive recording material having a heat-sensitive recording layer on a substrate. Exceeding the first set of resource constraints will cause the application instance to be terminated. The duct has an upper housing member which accommodates therein a first brush roller and a third brush roller that extend parallel to each other and a lower housing member which accommodates therein a second brush roller and a fourth brush roller that extend parallel to each other. The master station, remote from the patient bed, is operatively coupled to the bed status system to receive bed status information. If the subscriber is not registered according to the tracked protocol, a response is formulated to the first message.