A self aligned method of forming a semiconductor memory array of floating gate memory cells in a semiconductor substrate having a plurality of spaced apart isolation regions and active regions on the substrate substantially parallel to one another in the column direction. Thus, a local oscillation tends to provide a greater degree of stability. Several wireless access points are disposed in the building, and the mobile viewing system is connected to some of the wireless access points. Still further, the handset is capable of serving as a personal ornament of the user. Both sealing bodies are placed in pressure-sealing contact with the pipe when the valve device is in an inactive position of rest, while at least the primary sealing body is placed in an open position when the valve device is in an active position.