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why isn't it ok? why????
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master/slave could be primary/secondary, primary/subordinate or principle/agent, so you're correct on that replacement.
I personally am a big fan of "Mantrap" becoming an "Access Control Vestibule" mostly because it's fun to say.
I like controller/peripheral, which is the most descriptive in my opinion. That's what's commonly used for SPI.
I've been using parent/child, I guess that's not always correct?