A system and method for controlling processing equipment. The system includes a control computer communicatively coupled to a terminal computer. Voice data for each of several authorized operators at a plant is stored. The control computer is programmed to implement a voice recognition and authenticated voice-activated control program. The control computer, responsive to receiving a voice-derived input, analyzes the voice-derived input to determine if the voice-derived input matches the voice data for any of the authorized operators. Provided the voice-derived input matches the voice data, the control computer determines at least one command from the voice-derived input for controlling the processing equipment to modify an operation at the plant. The control computer executes the command to control the processing equipment.