SuperTrafficBoard Client (STB) can be run on the same computer as your simulator, or on a different computer.  The reason you may want to run it on a separate computer is related to simulator full screen mode.  If simulator full screen is required (for Prepar3D this means "blackout desktop"), you must run STB on a separate computer.  Otheriwse you might want to run STB on a separate computer if you are short of screen space on your simulator computer. In order to operate on a separate compu