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I've actually seen the 'modern' versions referred to as independent, live PTO. If you apply both terms to it, that indicates different meanings. In my mind, 'live' should refer to a PTO that gets engine power directly, not from the transmission. 'Independent' should refer to a PTO system that has its own clutch and can be operated independently from the transmission (even if its not live, as described above). Those are just my definitions. They may not be accurate, and they may add more confusion to the topic. Consider them at your own risk.
Row-crop was already defined, I can't add anything extra to what's been said.
Live hydraulics. I believe this is related to the live PTO concept. Someone can correct me if I'm wrong. I'm pretty sure some early hydraulic systems were driven from the transmission, like the PTO shaft was. So, there wouldn't be hydraulic power unless the tractor was moving, or sitting in neutral with the clutch engaged. If you had a loader on the tractor, you wouldn't be able to push the clutch pedal to stop the tractor while you raise the loader because you'd lose hydraulic power. You'd have to put the transmission in neutral and release the clutch pedal to have hydraulic power while stationary.
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