Library /sys$common/syshlp/helplib.hlb
SET, DEVICE, Qualifiers, /DUAL_PORT
 *Conan The Librarian 

       /DUAL_PORT
       /NODUAL_PORT

    Controls whether the port seize logic in the device driver of
    the specified disk is to be enabled. This qualifier should be
    used only on disks that contain a dual port kit and have been
    dismounted.
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