What do the upstream/downstream USB ports on a monitor do?

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Track title: Techno Bleepage Open

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Chapters
00:00 Question
00:43 Accepted answer (Score 80)
01:51 Answer 2 (Score 9)
03:49 Thank you

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Full question
https://superuser.com/questions/856297/w...

Accepted answer links:
http://en.wikipedia.org/wiki/USB

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