Video and audio materials can be played using the free VLC player, which is available for computers running any of the Linux, Macintosh and Windows operating systems.
Please note that you can view a video in full-screen mode by hitting the "f" key on your keyboard after it starts playing. You can pause the video using the spacebar. Other VLC functions can also be accessed by means of "hotkeys", a list of which can be viewed by selecting Preferences from the Tools menu (or using the control-P shortcut) and then clicking on the Hotkeys button (see below).