It wasn't well described in the PDC manual, but I was able to confirm my thoughts with the manual from the QUADRILL DR 18/4 E and PD 20/4 E where it's explicitly mentioned along with a diagram.
[attachimg=1]
In the Festool manuals, the items being described are coloured grey in the diagrams, so the observations above are confirmed as correct with this diagram below;
[attachimg=2]