INDEXORD()

    INDEXKEY() determines the position of the controlling index in the list
    of index files opened by the last USE...INDEX or SET INDEX TO in the
    current work area.

Syntax

    INDEXORD()

Returns

    An integer numeric value.

    INDEXORD() returns the position of the controlling index in the list of
    open index files.  A value of zero indicates there is no controlling
    index and you are accessing the current database file in natural order.