Library /sys$common/syshlp/uafhelp.hlb MODIFY, /IDENTIFIER, Qualifiers, /VALUE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /VALUE=value-specifier

    Specifies a new identifier value. Note that an identifier value
    cannot be modified from a UIC to a non-UIC format or vice versa.
    The following are valid formats for the value-specifier:

    IDENTIFIER:n     An integer value in the range of 65,536 to
                     268,435,455. You can also specify the value
                     in hexadecimal (precede the value with %X) or
                     octal (precede the value with %O).

                     To differentiate general identifiers from UIC
                     identifiers, %X80000000 is added to the value
                     you specify.
    UIC:uic          A UIC value in the standard UIC format.