Provided is a method of key agreement between devices. Methods for using the memory cell in memories and other devices and methods specially adapted for fabrication of the memory cell are disclosed. A sample media is used to secure the sample. As various error conditions are recognized, information relating to the error conditions is provided directly to the packet switched device to enable the packet switched device to restore communications with minimal delay. A coherence domain for the multiprocessor system includes the processors and processor memory system of the processing sub-system and the local caches of the IO sub-system. The pre-cut section forming the lower part, when spread out flat, is substantially one of trapezoidal and ring segment-shaped, and the lower part is funnel-shaped in the inflated state of the gas bag.