Those are Document groups, and they are not differentiated between web and manager.
Ok, I see... sorta. SO the document group has nothing to do with the permissions, roles handle the permissions. Regardless of the user type I can assign them to the same document group and MODx will let them do whatever according to the role and user type.
As you can see I am a bit confused, most likely over thinking it. I am sure that this will all make sense once I get more experience with the concept. There are plenty of docs, and I am sure I have gone through all of them and still am a bit confused. No stress, I am sure I will get it right eventually, I am having a bit of a brain overload lately so as soon as I can look at this with some calmness I am confident that it will sink in. I am sure that if this has worked so far for so many people than it should work fine for me as well
Just to see if I have the correct idea: I have a website where there are around 40 contributors who need to be able to manage only their own pages. So in order to do this I need to; 1) setup a manager user for each contributor, 2) setup a document group for each contributor, and then 3) assign each document to the correct document group. Then in order to isolate all the remaining public pages I need to assign those to a document group as well. Does that sound right?