I give regular online exams without any protoring software, pure honor system. I have three students who live together who consistently turn in identical work. What I don't understand is why the keep doing it, when I keep giving them 0s for copying.
I was able to see current and past residence data, which I suppose could have helped me verify the student's identity ("what post code[0] do you currently live at?"), but I tried not to look at that information when possible.
Lecturers also had access to this system (it dealt with some submission data), so I guess they may have had access to view residency data?
This is just an educated guess based on my experience, though.
[0]: For American readers, think ZIP code
Crazy stuff.