I just finished watching T3 again and it got me thinking.
No matter what they did even in the previous movie Judgement Day would always have happened. Because there was another group of people working on Skynet and all the automated stuff at the location Katherine's father was. Although this was probably not even thought of or written at the time of T2 but I find that interesting.
Also in T3 how did the Skynet/virus thing get started? It had to have a point of origin? Howcome they never put that in the movie?