Library /sys$common/syshlp/sysmanhelp.hlb IO, SET, EXCLUDE, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 (device_name)

    Specifies the device type to be excluded from automatic
    configuration. Use valid device names or mnemonics that indicate
    the devices to be included in the permanent exclusion list. You
    can specify wildcards.