/sys$common/syshlp/SDA.HLB
SPAWN, Qualifiers, /OUTPUT
 *Conan The Librarian 

       /OUTPUT=filespec

    Specifies an output file to which the results of the SPAWN
    operation are written. To prevent output from the spawned
    subprocess from being displayed while you are specifying new
    commands, specify an output other than SYS$OUTPUT whenever you
    specify /NOWAIT. If you omit the /OUTPUT qualifier, output is
    written to the current SYS$OUTPUT device.
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