what would a seed do? random is random (i think... )
Computer generated random numbers aren't truly random and are generated using an algorithm (there are lots of different methods), but that algorithm needs a starting number to generate all the others from. If you put in the same seed number, you'll get the same results each time, so often people use the current time in milliseconds to seed the generator so that it appears different each time. However, like Broo said, it can be useful to set the seed number, especially if you want everything to happen as it did the first time like in replays for example.