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N_XINDEXKEY()
Get field list for specified index number

Syntax
N_XINDEXKEY([<nIndex>])

RDD Option
Use INDEXKEY()

Argument
<nIndex> is the number of an index in the current table.

Returns
N_XINDEXKEY() with no arguments returns the number of indexes.

N_XINDEXKEY(<nIndex>) returns the name of the Nth index in the current 
table. Multiple field names are separated by commas ( , ).

Remarks
The Clipper INDEXKEY() function returns the index expression, while this 
function returns the list of fields in the index.

Example
N_XSELECT('patients')
? N_XINDEXKEY()
3
? N_XINDEXKEY(1)
ID
? N_XINDEXKEY(2)
LAST_NAME, FIRST_NAME