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The GUI version also allows you to run individual commands. Select the "GUI" mode from the drop list in the lower left corner of the window. The GUI will then allow you to create and run one command at a time. This is useful for testing a single command, but may be more tedious than running in text mode (see below).
The "Threaded}" mode allows you to simulate multiple students sharing laundry piles. Each student runs a difffernt set of commands from individually specified input files. There appears to be a latent threading bug that has nothing to do with the student code that can pop up occasionally and crash the simulation. Running multiple students is not a requirement here and nothing in the student-written code would affect this, so don't worry about running in {{Threaded mode, though it is kind of interesting to watch.
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