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Depending on the type of audio or video resource, closed captions (a text version of the audio that is shown synchronized in the media player), transcripts (a separate text version of the audio), or audio descriptions of visual information (an additional audio stream that describes context essential for comprehension of the visual content) need to be available.
Classroom computer does not play audio through the installed speakers. When waking from sleep, Windows will sometimes switch to the first audio output device it sees, rather than the previously-selected output. This will cause audio to be played from the computer itself, a monitor, or to not be audible at all.