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GPSS/H has a strong history of successful use in both commercial and academic environments. The product continues to evolve and to grow in use. In this paper, a general overview of GPSS/H and its transaction-flow world view is given. A discussion is presented on graphical modeling, its advantages and its downfalls. GPSS/H's advanced and newly added features are highlighted. The concept of a special-purpose simulator is described, along with those features of GPSS/H which make it ideal for use as a simulator engine. Wolverine's family of run-time product offerings, and how they can be used to distribute confidential models or to support special-purpose simulators, are also summarized.