The GetOpenDocuments command returns a list of handles to all open Inventor documents.

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

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

$\mathrm{docs}≔\mathrm{GetOpenDocuments}\left(\right)$

$\mathrm{docs}≔\left[0\,1\,2\,3\right]$

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