In NetWare 4.x, attached to any object for which an external reference is required by a remote server.
For help in understanding the attribute definition template, see Reading NDS Attribute Type Definitions.
This attribute contains the set of servers that store an external reference to an associated object. The attribute is used to notify such servers of changes in the status of the object. For NetWare 5.x, see the Used By attribute.
LDAP clients cannot access this attribute because the LDAP server does not currently support the Back Link syntax.