INDEXKEY()

    INDEXKEY() returns the name of an index.

Syntax

    INDEXKEY(<exp N>)

Argument

    <expN> is the ordinal position of the index in the list of index files
    opened by the last USE...INDEX or SET INDEX TO command for the current
    work area.  A zero value points to the controlling index, no matter
    what its actual position in the list.

Returns

    A character string.

    INDEXKEY() returns the key expression of the specified index.  If there
    is no index for the position the function argument points to,
    INDEXKEY() returns a null string ("").