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G-Networks are queueing networks in which the novel idea of 'Negative customers' has been introduced. In contrast with the regular customers, called positive customers and treated in the normal way by a server, negative customers are also included. "Negative customers" and "Signals" can act in the network in several ways: they can destroy a positive customer in a queue, trigger the instantaneous passage of a customer to another queue or cause the departure of a batch of customers. This concept of negative customers or signals that can act in the network enhances the queueing network model with control capabilities, thus making G-Networks important and useful in performance modelling.
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