An opening in a housing of a computing device. If the interface is a web browser, for example, accelerator keys may be associated with link elements, e. The selectively interchangeable sprocket rings include different dimensional characteristics and tooth configurations, which produce a wide range of final drive ratios. The bit line and reference voltage are coupled to the sense amplifier so that a voltage is received based on charge stored in the memory cell. The mobile station may also detect the energy parameter of the second energyposition pair being greater than the energy parameter of the first energyposition pair.