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The growing importance of telecommunication networks has stimulated research on a new generation of programming languages. Such languages view the network and its resources as a global environment in which computations take place. In particular, they support the notion of code mobility. To understand, discuss, evaluate, and compare such languages, it is necessary to develop a new set of programming language concepts and/or extend the concepts that are used to deal with conventional languages. The purpose of this paper is to provide such framework. This is done hand-in-hand with a survey of a number of existing new languages.