Techniques for collaborating on a spreadsheet file by client computers in real time are disclosed herein. The seatback is preferably tiltably connected to a seat cushion. Additionally, the memory cells may include an amorphous region between the charge-retaining region and the crystalline ultra-high k dielectric material, andor may include an amorphous region between the crystalline ultra-high k dielectric material and the control gate material. The storage device stores the sensor information. The activation signal can be propagated in the system in one direction from the master to the last module, or carried bi-directionally allowing two way propagation, using a module which revert the direction of the activation signal propagation direction.