To create or delete a file directory on disk, or to change the
password or file protection values for such a directory, first ASSIGN
and mount the UDP (if you want to do this to a UDP), then type the
monitor command

     UFD DEVICE:PRJ,PRG

     where device is the name of the disk and PRJ,PRG is the name of
the directory in question.  You must know the pack password to create
a new directory on a UDP; the master password to create a directory on
DSK whose programmer name does not match your logged-in programmer
name; the directory password (if any) to modify or delete an existing
UFD.  Before deleting a UFD you must first delete all the files in it,
e.g., by typing

     DELETE UDP1:*.*[PRJ,PRG]

     The UFD command runs a program in your core image.