Before I ask this I would like to make it known I am not trying to crack or hack an operating system... I would like to use my old computer to run multiple operating systems so I can test stuff on them and in case I ever need to utilize them for any other purpose. I have friends that have the discs for the OS I need, the question I have is, is there a way for me to install OS other than Linux obviously, that don't require authentication or a key or what have you. I know microsoft's utilization of product keys but I have honestly never installed a mac OS I have only used them. Is it possible to install these versions of windows without having to use the keys just for testing purposes? Like if I just don't connect them to the internet and do the genuine validation or whatever. Which is still probably considered pirated software or something but I would really just like to have a copy of it to test on not to use.... not sure if anyone can answer that for me but if so I would be greatly appreciative.