Several objects on the same coordinate - how to get them all?

Problem/Motivation

I have several polygons that share part of its area.
They show up on the map overlayed, on top of each other, and that's fine.

I already have a sort that can show smaller to larger polygon.

When I mouse click on the on-top polygon, is it possible to get all the nid's of all the polygons that are under that mouse click?

At the moment, when I click on that smaller polygon, I get the nid, I can get a popup with a view mode, and that's good.
But, I would also like to give access to the user for the remainder polygons that have that same coordinate from the mouse click.

Thanks.