Place your mouse cursor inside the movie window. Then, while holding down the mouse button, drag to the left or to the right.
Place your mouse cursor inside the movie window. When you move the mouse cursor on a certain object, you will notice that it turns into an arrow. Left click the object and you will see its detail. By clicking the object again, it will take you back to the previous scene.
Sometimes you will see a clickable label that will take you to a certain part of the scene.
Portal