A number of simulation domains with discrete-event semantics has been developed for Ptolemy, but only the DE domain is released with Ptolemy 0.7. The DE domain is a generic discrete-event modeling environment, useful for simulating queueing systems, communication networks, and hardware systems. The discrete-event domains no longer released with Ptolemy 0.7 are Thor [Tho88] for modeling circuits at the register-transfer level [Kal93], communicating processes (CP) for modeling large-scale systems at a high level of abstraction, and message queue (MQ) for modeling a centralized network controller in a large-scale cell-relay network simulations [Lao94].
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