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The model I created is a representation of a rash being formed in a particular manner.  The rash will always be the same under my requirements that make it a deterministic model.  The thing I've been thinking about is how deterministic models interact with each other.  What would happen if this one rash would overlap or run into itself or another deterministic rash example?  Would they then dance together and spread more or because both of their programs have run through completely, would they merge and just end their spreading?  It of course depends on the output that is given from the computer at the time--if there is more for the program to compute, of course it wont stop until it has finished.

Are they truly deterministic or are there minor "surprises" to us that we don't see--with two instances interacting with each other?

To give an opinion to a great question asked above, I think that they still _will_ be deterministic, but we never know until we can test two of the same/almost same models in close proximity to one another.