A dual-port memory system is implemented using single-port memory cells. The system comprises a horizontal seat support frame having a rear support member, front support member, and spaced apart side support members. The input signal distribution buffer is configured to distribute a clock signal within an inputoutput block clock region. According to the inventive methods, the cells can be selected on the basis of intrinsic or induced differences in a characteristic electroporation threshold, which can depend, for example, on a difference in cell size andor critical dielectric membrane breakdown voltage. The advertising dialogue system provides any service associated with the advertising action as automatically available to the user. Various additional circuits and illuminating apparatuses for producing light from AC power using a LED lamp are also provided.