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SET, QUEUE, Qualifiers, /RECORD_BLOCKING
 *Conan The Librarian 

       /RECORD_BLOCKING
       /NORECORD_BLOCKING

    Determines whether the symbiont can concatenate (or block
    together) output records for transmission to the output device.
    If you specify the /NORECORD_BLOCKING qualifier, the symbiont
    sends each formatted record in a separate I/O request to the
    output device. For the standard OpenVMS system print symbiont,
    record blocking can have a significant performance advantage over
    single-record mode.
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