115.Section 68 provides that the registrar must keep an index which will indicate for any parcel of land in England and Wales, if there are any registered estates relating to that parcel and if there are, the title number or other identifier used for the register(s) relating to that parcel. The index must also show if there is a caution against first registration of unregistered land. Rules may specify how the index, and the information in it, is to be kept and how official searches of that index are to be undertaken. Rules may also specify additional information to be found from the index.