OK, I have been playing Civ4 at home for a little over a month. Due to the nature of my job, I often have prolonged periods of downtime, during which I cannot leave. So I decided to install Civ 4 at work. Do I have to keep shuttling the discs back and forth from home to work everyday? Am I supposed to buy a copy for my work PC? I know there are probably CD protection hacks out there or something like that, but I don't want to know about stuff like that. I just figured since I bought it, I might be able to run it on more than one PC. Most gamers have more than one PC these days anyway. TIA.