04-10-2012
Back in PDP-8 days in UNIX, RSX and in VMS, a hotfix was a change to a running system's software (like patching) that did not require the system to go offline. Timeframe: ~1979 I think was maybe the first time I heard it. IBM had hot swap disk pack components on some mainframes, so I guess that is the ultimate origin of 'hot' things.
I was old back then. I'm a lot older now.
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