Disclosed is an apparatus for use in the measurement of the heat generated in a chemical or biochemical reaction, by detecting and measuring a change in the conformation of a polymer transducer responsive to a heat change, the transducer being bound to the surface of the waveguides of an interferometer. The first media client may determine an occurrence of an event associated with the parental control feature. , a cable or wire, to be fished through an opening andor conduit. By means of a connection to a multimedia network, these values can be communicated from the hospital bed.