Changes done to some system object names enable Fb 1.5 to be installed and used on a computer which already has InterBase or Firebird 1.0.x installed. On Windows, FB 1.5 also uses another Registry key--and use of the Registry entry is optional. If you set up the servers to use different network ports, it is possible run a few server instances concurrently, or run Fb 1.5 while IB or Fb 1.0.x is running.