This  is the VMS Terminal Fallback Utility (TFU), the user interface
   to Terminal Fallback Facility (TFF). The TFU supersedes the function
   served  by  the  former  (VMS Version 4.x) DCL SET TERMINAL/FALLBACK
   command.

   Use the HELP command to display on the current default output device
   (SYS$OUTPUT) information available in the TFU help file.

   Format:

       TFU> HELP    [keyword ...]