Trailing-Edge - PDP-10 Archives - BB-PBQUC-BM_1990 - help/ctrlf.hlp
There are no other files named ctrlf.hlp in the archive.

Provides recognition input for file specifications and  command  names
and  arguments.   Similar  to the ESCAPE key, except that it completes
only one field at a time with file  specifications  and  it  does  not
supply guidewords with commands.