Turn it in and plagiarism
I didn't know about this turn it in thing prior to the show. We have a lovely solution where you have to hand in your paper and a copy of your paper on disk and in really annoying cases the articles you have cited most often. So in principle turn it in is less annoying.
As far as what you guys were saying about handing in the same paper more than once that actually is cheating, at least it is in Adelaide universities. I'm not being one of those "it is evil you guys are leading people to immoral behaviour and are going to hell" because I've done it before, I've got a paper on Cultural Safety that has been recycled about 6 times (for 6 distinctions) but it is technically cheating.
Apparently it is also cheating to move books in the library so that other students can't find them.