The system should make each user aware of control inputs made by others, and ensure that the control actions of one user are not unknowingly reversing another user's actions.
Additional Information:
Some input interfaces for controlling plant variables can be accessed from multiple locations in the HSI. Some process plants with computer-based HSIs address this problem by assigning control capabilities for a plant variable to a particular control console. Users at other consoles can observe the control setting but cannot initiate changes.