/KB_CONTROL  (default)
   /NOKB_CONTROL

   Enables (or disables) an ALLOWed watcher from supplying input for
   your terminal.

   /KB_CONTROL is a DCL positional qualifier. It can be used at the
   start of a PEEK/ALLOW command line, before any identifiers, in which
   case it applies to all identifiers on the command line. It can also
   be used on the PEEK/ALLOW command line after a particular identifier,
   in which case it will apply only to that one identifier in the list.

   Examples:

         $ PEEK/ALLOW/NOKB_CONTROL J_JONES,J_DOE
         $! J_JONES and J_DOE may watch you but without KB_CONTROL.

         $ PEEK/ALLOW J_JONES/NOKB_CONTROL,J_DOE
         $! J_JONES and J_DOE may watch you but only J_DOE may toggle
         $! input (since KB_CONTROL is the default).

   ALLOW/NOKB_CONTROL has no effect on SPY, nor on privileged PEEK users.