A composition-of-matter is provided. It allows the specification of security policy across a wide variety of networking layers and protocols. The leg assemblies each include an upwardly extending pedal arm terminating in a pedal. The present invention also provides improved systems for generating a plurality of nucleic acid molecules that differ at one or more nucleotide positions. During the process of moving the memory contents, the operating system stalls Write memory requests addressed to the real address space currently associated with the sourcing memory module indicated by either the FROM or TO real address space.