is this what you are looking for?

CANDIDATE([nIndexNumber] [, nWorkArea | cTableAlias])

>I've been using that code since a while to have an overnight process to always build a PRG file just in case we would have to recreate all the tags:
>
>

>FOR lnTag = 1 to tagcount()
>   lcProgram = lcProgram + '	index on ' + sys(14, lnTag) + ' tag ' + TAG(lnTag) + CR
>NEXT
>

>
>This works well. However, now I have a table which has a candidate key on it. How can I modify this code to assure that when rebuilding the candidate key will be preserved?