A system and method for providing interactive graphical and multi-media connectivity between a plurality of users, especially in the context of shared content. The cushioning pad has tuck-in grooves in which the seat covering is locally retained. Error control decoding of the transmitted frame is achieved between reception and descrambling at a receiving device. The system further includes a lock system having a signal receiver and a verification component. By increasing andor decreasing the flow rate of the reagent mixture from the point of mixing to the point of detection, one alters the amount of reaction time, allowing monitoring reaction kinetics over time. The programmable delay circuit may provide a relatively large overall signal delay, while also providing a fine temporal resolution.