This is a FedSIS used for some people during the August workshop (Eugenia, Monro, Helper, etc.) This training FedSIS is usually destroyed and re-created every once in a while.
This is a FedSIS used for testing, practice, training, etc. It was used with training with Bob from OS4Ed. It is not the final real data and you can play with this without fear of affecting anything in the real system.
This is the FedSIS used in production and it the final correct data. You should take a bit more care with this one as it affects the data you will eventually be submitting and using as your real data.