Code, Software and Serious Games

Well, I'm quite dizzy. I tried looking up the Church-Turing thesis that was mentioned in the "There is No Software" article, but Wikipedia is no help at all. Anyone have a dumbed-down explanation they could share? I'd appreciate it. Without knowing what it is, I have a hard time figuring out how Kittler's using it in terms of that article.

Bearing in mind that I may have missed one of his maint points, I keep trying to draw lines with Kittler and I keep coming up short. If we can reduce software to the point that there is no software anymore, how do we define hardware any differently? I want to say that the hardware is where the action ultimately happens, but even that's kind of arbitrary, because there are yet more layers of technology behind the hardware - and they're as impenetrable to me as software or Church-Turing theses.

I don't find it very productive to reduce a computer all the way back to Mother Nature, so I'd like to have a line drawn somewhere, but I don't think that Kittler does that. That's why the argument fails for me: if I'm going to draw lines arbitrarily, I may as well start with software. Is there a better way to delineate between the two, or have I misunderstood Kittler's reasons for not recognizing software in the first place? It's an interesting idea.