Lets use a familiar example to illustrate some features of the emulator.
Load the hello world program into Emacs, and once more run the emulator and load the program. Redefine the hello world program by typing the following text in at the emulator prompt. Now try running the program. This procedure would look like the session in Figure 5 Concurrency and Scheduling Multiple message sends in a method are by default concurrent, so the three message sends in the above method could potentially execute in any order. This is the basic mechanism for specifying concurrency in Concert programs.