How does the scheduled break work for digital AP Exams with two sections?

A digital AP Exam begins, and the timer starts counting down, when each student enters the start code. Students in the room may begin Section I of the exam at slightly staggered times. The proctor could choose to wait until all students have completed Section I before releasing them for their break or allow students to go on break as they finish. When the timer for the break expires, a Resume Testing button appears, and students click this button to begin Section II. Note that Section II does not begin automatically.