The most important concept of a PCSIM simulation is the network. A network consists of different kinds of objects wich are linked together by certain message channels. Hence the construction of each PCSIM simulation starts out with the construction of an (initially empty) network.
>>> net = SingleThreadNetwork()
When we will discuss how to run a distributed simulation we will see that there are different types of networks available. For the moment we will use SingleThreadNetwork which is the simplest one.