Examining and controling the user environment.
    (Also see Logical_names, Physical_devices, and Terminal_environment)

  SET COMMAND       Updates the commands available to the process.
  SET CONTROL       Controls the use of the CTRL/T and CTRL/Y keys.
  SET DEFAULT       Changes the default device and directory.
  SET HOST          Connects your terminal to another system via DECnet.
  SET MESSAGE       Overrides or supplements system messages.
  SET PASSWORD      Changes your password.
  SET PROCESS       Changes your process characteristics.
  SET PROMPT        Sets the interactive command prompt.
  SET PROTECT/DEF   Changes the default protection given to files.
  SET RMS_DEFAULT   Changes the default block and buffer count values.
  SET SECURITY      Changes the protection code, ACL, and owner of a
                    protected object.
  SET WORKING_SET   Changes your working set limit or quota.
  SHOW DEFAULT      Displays the default device and directory.
  SHOW KEY          Displays one or more function key definitions.
  SHOW LOGICAL      Displays logical names and their equivalencies.
  SHOW PROCESS      Displays your process characteristics.
  SHOW PROTECTION   Displays the default protection.
  SHOW QUOTA        Displays your quota of space on a disk volume.
  SHOW RMS_DEFAULT  Displays the default block and buffer count values.
  SHOW SECURITY     Displays the name, class, and profile of a protected
                    object.  The profile lists the object's access control
                    list (ACL), protection code, and owner.
  SHOW STATUS       Displays brief process characteristics.
  SHOW SYMBOL       Displays the value of a symbol.
  SHOW TERMINAL     Displays terminal characteristics.
  SHOW TIME         Displays the current date and time.
  SHOW TRANSLATION  Displays a logical name and its first equivalence.
  SHOW WORKING_SET  Displays your working set limit and quota.

  Type ? to display the list of HINTS.
  Type USER_ENVIRONMENT to redisplay this particular hint.
  Press the RETURN key before typing a command or topic name.