The presentation layer remains the same, but the session layer may change as the user travels. The application layer remains the same, but the presentation layer changes as the nomad travels. For example, as the nomad travels about the world, the presentation layer changes to support the translation of the nomad's native language to the local lnaguage. The following are some examples of nomadic environments outside the ISO OSI layering. In many corporate environments, the system administrators impose this strategy to homogonize the system requirements and system support.
Some applications run for years, i.e., they take years to calculate their results.
The following is a rationale for each of the needs identified by the nomadicity group. The rationale is based upon the core concepts of nomadicity. In each case, the rationale in not intended to be exhaustive, but to demonstrate that the rationale, in part, can be derived from the code concepts. An implementation need based upon the abstract need for continuity over space and time. Included in this need is a requirement to track the proximity of services required by the nomad.