A quartz crystal sensor cell in which the sensor is secured to the base of a well defining a test sample space by a layer of adhesive between the respective peripheral surfaces. The message from a sender device is formed by a plurality of symbols and includes a first message integrity indicator located at a predetermined distance from the start of the message such that further symbols of the message are included after the first message integrity indicator. A layer of diffractive or retroreflective material is secured beneath the textile fabric layer, either directly or beneath a layer of substantially transparent material. A timing sensor is adapted to detect an instantaneous speed of the rotating member and preferably triggers the data acquisition member to begin sampling when the rotating member is rotating. A DSL service provider provides Internet access service and a service manager manages the prepaid service. Additional compositions and methods are provided which employ a phorbol ester or derivative compound in combination with at least one additional agent to yield more effective treatment tools to treat or prevent stroke and the long term effects of stroke in mammalian subjects.