Library /sys$common/syshlp/nclhelp.hlb NCL Introduction, Syntax, Attributes, Identifiers  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    In most cases, an entity has one identifier: the simple name that
    is assigned to it when it is created. This identifier is a unique
    instance name within the entity class and cannot be modified
    except by deleting the current entity and re-creating it with
    a new name. See specific entity description sections for more
    information on entities that have multiple identifiers.