Rectangular and Polygonal Hot-Spots are the active objects.
Hot-spot is an invisible area you can define on the screen
where your viewer (user) can click or move mouse to make
something happen. The area could be around a word, on the
image etc.
Hot spot is invisible to the viewer. However, in the designer
you see hot spots as an area with a dashed border.
From 4.9.5 you can define new polygonal hot-spot, which drawing functionality is virtually identical to Polygon object.
TIP: Hot-Spot object can contain the image data loaded by ReplaceImage command. In case of the Polygonal Hot-Spot, the Image will cropped by defined polygon.