/sys$common/syshlp/UCM$HELP.HLB  —  ADD  DEVICE  Qualifiers  /BUS_NUMBER
       /BUS_NUMBER=number

    Specifies the USB bus number of the device. This parameter is
    required to identify a particular device on a system that has
    multiple USB buses. If you do not use this qualifier, the bus
    number defaults to zero.

    The number can be from 0 through 25.
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