[AndrewC]

If you don't believe in undirected natural processes, then obviously you don't believe computers can model them--computers can't model something that doesn't exist.

Sure it can. You aren't implying that the game "Doom" does not exist? Or are you implying that the characters and the world of "Doom" does exist? How about Dr. Freeman and "Half-life"?

[Ha Ha Thats Very Logical]

You aren't implying that the game "Doom" does not exist?

I don't think I'd call that "modeling."