\setupinteraction[state=start]

\starttext

    \bTABLE \bTR \bTD \index{test 1} entry 1 \eTD \eTR \eTABLE \page
    \bTABLE \bTR \bTD \index{test 2} entry 2 \eTD \eTR \eTABLE \page

    \placeregister[index][n=1]

\stoptext
