Your teacher can take control of your book and lock you in a screen. This is the notice that you'll see at the top of the screen.
When you block, you'll see the same lesson that is watching the teacher and you can not change section. That Yes, you can answer questions in that section.
The teacher has another way to lock your screen: through the "Pay attention" notice. When you activate this function, you can not do anything on the unit. The intention is that you pay attention to his explanations.
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