Library /sys$common/syshlp/sysmanhelp.hlb DISKQUOTA, MODIFY, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 owner

    Specifies the user identification code (UIC) or rights
    identifier. You can specify the UIC in numeric or alphanumeric
    format. For complete information about UIC specification, refer
    to the OpenVMS Guide to System Security.

    Rights identifiers are granted with the Authorize utility and
    use an ID format rather than a UIC format. Refer to the OpenVMS
    Programming Concepts Manual for a complete description of rights
    identifiers.

    When working in nonlocal environments, make sure that the
    alphanumeric UIC or rights identifiers that you use are valid
    for the environment.