Peek/Spy allows a user to watch another user's screen and
   (optionally) type keyboard input for the user being watched.

   Terminals to be watched may be specified by process-name.
   process-id, terminal-name, or username.

   Nodenames and wildcard characters may be used. (See the PEEK
   Watching Subtopics: Node_Names and Wildcards.)

   Command Format:                      Example:

    $ PEEK process_name_list            $ PEEK PROCESS12,PROCESS3%
    $ PEEK/IDENTIFIER=pid_list          $ PEEK /ID=(12%,5F8,345)
    $ PEEK/TERMINAL=terminal_name_list  $ PEEK /TERM=(LTA1262,TXA*)
    $ PEEK/USERNAME=user_name_list      $ PEEK /USERNAME=(JONES*,BREWERJ)

    $ PEEK                              ! Enter command-prompting mode.
    PEEK> WATCH NODEA::*                ! Watch all processes on NODEA.
    PEEK> WATCH/IDENTIFIER=NODEB::5F8   ! Watch PID 5F8 on NODEB.
    PEEK> WATCH/TERMINAL=*::LTA*        ! Watch all LTA's on all nodes.
    PEEK> WATCH/USERNAME=*::VISITOR_*   ! Watch users VISTOR_* on all nodes.