All control was transferred from the process computer to the human operators.

The human operator didn't even look up as the machine spit out our cards.

For now, human operators do control even the computerized systems.

The only thing was that there were no sounds of any human operators.

But the machine required a human operator, and it was difficult to control.

But the images do go to human operators, and they make a decision.

If these had been human operators, rather than computers at work, someone would simply have eventually stopped screaming.

Only a human operator can break into a computer which isn't on-line.

All the trains had to be operated by the single human operator.

No human operator could hope to bring it off; the actual shift would be under the control of the computer.