6.1.1.4.13.4 Instances Group Object
In AD LDS, every DC's service account belongs to this group. The system attempts to maintain this group, although an administrator can still modify the membership. This group is only present in the Roles container of the config NC.
name: Instances
RID: 518
member: An AD LDS DC ensures that its service account is a member of this group. If an AD LDS DC's service account is Network Service or Local System, the DC also ensures that its computer object is a member of this group.