Abstract
The paper deals with an invariance principle for queues in heavy traffic, The paper contains 5 sections. In the first one we give a description of queueing systems. Besides of well known results in section 1 there is a new one concerning the behaviour of the actual and virtual waiting time in heavy traffic situation. The applications to results of sections 2 (Functional limit theorems) and 3 (Invariance principle) are given in section 4.

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