Library /sys$common/syshlp/MAILHELP.HLB  —  SPAWN  Qualifiers  /WAIT
       /WAIT
       /NOWAIT

    Controls whether the system waits until the subprocess is
    completed before allowing more commands to be specified. The
    /NOWAIT qualifier allows you to specify new commands while the
    specified subprocess is running. If you specify /NOWAIT, you
    should also use the /OUTPUT qualifier to direct the output stream
    to a file, rather than displaying it on your terminal. Doing so
    prevents your terminal from being used by more than one process
    simultaneously.
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