A scalable content delivery network employs a parallel download mechanism to ensure that a demanded file is present at a station in time for user consumption. In the first method, nuclei in the fluid are polarized over two distances and a measured magnetization gives the relative fraction of two components of the fluid for a selected velocity. The shaft includes threads that are mateable with threads provided in a bore of a magnet body of the braking assembly. Conflicting transactions are requested to abort themselves without being forced to abort. If the request to play the game is valid, an authentication token may be sent to the computing machine that allows the user to play the game on the computing machine.