I created three users. Me and two test users. I was the first user to register. So what I have learned so far...
The first user can see any apps that the test users create, the test users can only see their own apps and the teacher cannot edit the student apps (whether they should be able to I need to find out).
Jeff gave me some apps to test. I copied them to the applications directory and they appear in the admin interface but when I try to run them it gives me an error.
When a student creates an app and then uninstalls it. The app is removed from the applications directory but left in the applist.