Library /sys$common/syshlp/tff$tfuhelp.hlb HELP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   The OpenVMS Terminal Fallback utility (TFU) is the user interface to
   to Terminal Fallback facility (TFF). Use the HELP command to display
   TFU help information.

   Format:

       TFU> HELP    [keyword ...]