I had this debate with someone I know. He says it can't be done. We got pretty deep in thought about this. Ways to make your computer seem offline, or not there at all. We weren't really thinking about using proxys, and hiding your internet behavior but more on the side of blinding someone. Lets say that your best buddy had your IP, he knew you had a computer that was connected to the net. How would you hide the signs that your computer makes ?
Is there really any possible way?