21.1 A word of wisdom

     Please be aware that some of the previously described command
     line switches completely alter the way FrontDoor acts and may
     make it incompatible with other software and/or some
     environments.

     Use the switches with caution and when in doubt, try to test the
     effects of the switch in a local environment or between your own
     and a friend's system before you leave FD to answer your
     telephone unattended.