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I would actually argue that they are potentially two different concepts within that tag, but currently they all seem to be mutli-cam. There's a significant difference however, between the multi-cam editing features in modern NLEs and doing multi-camera (live switched) production. Non-switched simultaneous camera capture might be another area too. I'm not sure how we distinguish between those though. Perhaps this one should be multi-camera-post or something similar... I'm not sure.