Netbooting setup and requirements??


I know nothing about doing a netboot, except that the Mac wishing to do so must hold down the n key. Where can I get info on setting up a netboot machine? Must I be running MacOSX Server to even set this up? May the machine which normally netboots, also have an older version of OSX or even OS 9 on it, yet boot into the newest OS when netbooting?