Teaching Systems are a mobile learning environment, which allows a teacher to remotely access a students monitor without a IT experts support.
You can also safely make exams, homeworks and tests in the exam environment.
Hint: The Teaching System is not the same as the exam environment.
The Teaching System is an add-in to the normal Lernstick, the exam environment is a reduced version of the Lernstick, which is not used during class.