An article supporting device for use in a motor vehicle that is equipped with a pair of headrest supporting sockets in the backrest and a headrest removably mounted in the sockets. The method provides a substrate and forms a first conductive electrode overlying the substrate. Facilitating monitoring or analysis of large multivariable data sets provided in records and displayed in tabular form it is proposed to define blocks of fields having equivalent field values and display only one field value of a block. As a further option, the media itself can include a conductive layer so that the media can be the sensor. As a result, a user may use the wireless computer as a remote control for the audio-video device, controlling both the content presented and the manner in which it is presented. The signal is used to modulate an externally derived audio signal to produce a target indication signal free of background noise.