Command mode allows subcommands to be issued as verbs instead of
   as command qualifiers.

   As shipped, command mode is the default mode used during Peek/Spy
   interactive command prompting, and non-command mode is used for
   single-line DCL Peek/Spy commands.

   As shipped:

     In single-line DCL commands, subcommands are qualifiers:

       $ PEEK /ALLOW PETE      ! Allow PETE to watch you.
       $ PEEK /SHOW  USERS     ! Show users on system.
       $ PEEK JOE              ! Watch process JOE.

     During interactive command-prompting, subcommands are verbs:

       $ PEEK                  ! Enter command-prompting mode.
       PEEK> ALLOW PETE        ! Allow PETE to watch you.
       PEEK> SHOW  USERS       ! Show users on system.
       PEEK> WATCH JOE         ! Watch process JOE.

   The subcommands which are accepted as verbs in command mode are:

   ALLOW, ATTACH, DISALLOW, EXIT, FORMAT, HELP, LICENSE,
   NODE_NAME_CHANGE, NOSAVE_SCREEN, PEEK (for PEEK), QUIT,
   RT_ENABLE (VAX-only), SAVE_SCREEN, SHOW, SHUTDOWN, SPAWN,
   SPY (for SPY), and WATCH.

   When in command mode, you must use the WATCH (or PEEK for Peek,
   or SPY for Spy) verb when you want to watch someone. E.g.

     PEEK> WATCH JOE        ! Not  PEEK> JOE.

   The qualifier form of all the above subcommands is also still accepted
   when in command mode, e.g. "PEEK> /WATCH JOE" is accepted.