When you click on , a video of the lecture will open, along with images of each slide, synchronized to the video; the two display windows will be linked.

If you want the un-link the video presentation from the slides and have them play in separate windows, after beginning the video presentation, click on in the window that displays the slides (look in the upper right of the window). The two windows then will detach.

When you click on , your browser will display the slide images only.