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@mo That's the power of metaphor – and when it's not applied to people, that's all "master" and "slave" are. Words always gain meaning beyond the original use. We also still see "daemon" to describe a process that works in the background, but no Christians should be alarmed.
Now, that said: 1) I'm a white dude, so don't listen to me. 2) "Primary" and "Secondary" *ARE* just as good.