if you plan on having more then a dozen(*) players online at one time, then a fully multithreaded server farm (mutliple servers with each one running a mutlithreaded server program) is a must.
(*) a single threaded single server can most likely handle much more then 12, but much less then 1000 players without a problem. How much more or less I have no idea.
(*) a single threaded single server can most likely handle much more then 12, but much less then 1000 players without a problem. How much more or less I have no idea.