The GetActiveDocument command gets a handle to the active Inventor document.

$\mathrm{with}\left(\mathrm{CAD}\left[\mathrm{Inventor}\right]\right)\:$

$\mathrm{OpenConnection}\left(\right)\:$

$\mathrm{doc}≔\mathrm{GetActiveDocument}\left(\right)$

$\mathrm{doc}≔0$

$\mathrm{CloseConnection}\left(\right)\:$