   Make a private server?
  I bet all of u have heard of, World of Warcraft and Lineage 2 private servers.I mean its ok when u can download them from a website. But what if u want to make ur own machine. For example, there is a MMORPG that u don'twant to pay for it, and just want to have some private fun. How would u do it?   
  Not the best question to be asking on a game dev board (pretty sure server emulators are some kind of IP infringement, or at least a EULA breach).http://en.wikipedia.org/wiki/Server_emulatorIf you wanted to run one of these servers, you'd download the files and run them on your server...   ;  If you want to play an MMO game you should pay the subscription fees.If you don't want to pay the subscription fees you should either find a free alternative, or not play.   