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]

     UDPUFD is an alias of the UFD command that uses a UDP instead of
DSK as the device default.  If it can't figure out which UDP you want
it will ask you to specify it explicitly.

     The UFD or UDPUFD commands run a program in your core image.

     For more information about the UDP, see monitor command manual.