Origin of the term "hotfix"

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http://www.unix.com – This is not a technical question per se, but one I'm hoping one of the "old guard" might be able to answer all the same. I'm looking for the etymology of the word "hotfix" which is surprisingly murky in its origin, even with the help of Google. A quick look at Wikipedia, for example, cites World of Warcraft as its only source, and the word is certainly a lot older than that. We often see the term "hotfix" applied to mean a minor bug fix, or even a patch to a patch. But I'm wondering if the origin has a more specific meaning. I suspect that as Unix administrato (HowTos)