SYSTEM VMS

        [SIC\]SYSTEM ["Command"] [/PROCESS Process_Name]
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    Execute the VAX-VMS command specified by Command, or attach or spawns  a
    sub-process.

    If specified with an argument, the SYSTEM command tries to  execute  the
    requested  VMS command by creating a temporary sub-process executing the
    requested command. Control is returned to SIC after  completion  of  the
    command  and  the  sub-process  deleted.  This  mode is NOT RECOMMENDED,
    because it is time consuming.

    If no command is specified, the SYSTEM command spawns a  sub-process  or
    attaches  the  terminal to an existing one.  The sub-process prompts for
    SYSTEM commands at the user's terminal, with a $$ prompt to  distinguish
    it  from the parent process. Type QUIT to return to SIC.  The first time
    the SYSTEM command is used, the SIC monitor looks for all existing  sub-
    processes  and  asks  the  user  the  name of the sub-process to attach.
    Anwser by specifying the complete name, or press RETURN to create a  new
    sub-process.  If no sub-process is available, the SYSTEM command creates
    automatically a new one.  If a sub-process creation  fails,  the  SYSTEM
    command  identifies your current sub-processes, and prompts you to which
    one you want to attach.  Following  executions  of  the  SYSTEM  command
    simply attach to the same sub-process.

    Any sub-process created with the SYSTEM command is not deleted when  you
    exit  from the program running SIC, so that you may connect to it by VMS
    command ATTACH later (or by other program  using  SIC  with  the  SYSTEM
    command  of  course).  To kill the sub-process, type LOGOUT (in the sub-
    process !)  instead of QUIT to return to SIC. You  can  also  stop  your
    unwanted sub-processes (from the parent process) by the VMS command
        $ STOP <Sub-process_name>

    If the option /PROCESS is specified, the  SYSTEM  command  attaches  the
    terminal  to  the  specified process, which may have been created in any
    manner. No command is allowed in this case.