PREVIOUS  -  moves back  either  to  the  previous  screenful  of  the current
             message, or  if  you  are on the first screenful, to the start of
             the previous message.

NEXT      -  moves to  the  next  screenful,  or  of you are at the end of the
             current message, to the start of the next message.

SKIP      -  moves to the start of the next message. This is  the same as NEXT
             unless the current message is longer than a screenful.

DIRECTORY -  returns to the directory whence you came to get here.

ERASE     -  a privileged  command  which  allows  users  with  system UICs to 
             delete any message.  Non-privileged  users  should  use DELETE at
             top-level. The erase option deletes the current message.
