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Definition 2.3   A computer is said to be (operating) disconnected with respect to a certain server when it is unable to communicate with the server.

This will be the case when there is no telephone service available and the server is out-of-reach through any wire-less means of communication. In this case self-reliance and self-dependence are necessities.

It has been suggested [38] that in the future it will become unnecessary to discuss disconnected operation and that some sort of connection will always be and you should discuss different levels of connectivity and how to switch between domains. On the other hand [54] disconnected operation will undoubtedly always be cheaper (in terms of money, since it is free) than any level of connectivity and thus be preferable to the more "expensive" weak connections for (many) years to come--at least as long as the charges are non-negligible.