In this talk I demonstrate a simulator with a graphical user interface (GUI) for the Coordination Language Reo. Compared to a version presented in an earlier ACG talk, we changed the GUI in a number of respects to facilitate integration with the simulator. The hard part of the project turned out to be the proper implementation of the complex control of communication inside the nodes of a Reo network (`connector'). I will focus on some of the problems we had to cope with.