In the operation and monitoring environment, there are two types of screen modes. Operators can select either Multiple-window mode, like an office PC, or Full-screen mode, like a legacy operator console.

Full-screen mode	Multiple-window mode

The collection of data for display on the HIS is event-driven, i.e., The HIS starts collecting data only when the corresponding window is called up. Thus only the dynamic data in the currently displayed windows need to be refreshed. The data sampling load on the HIS is reduced and a one-second refresh rate for the dynamic data in the windows is guaranteed.

The process control industry standard open interface OPC (OLE Process Control) is used for collecting the process data, trend data and messages.

To prevent unauthorized access and reduce operator errors, there are extensive security functions that limit operation and monitoring range and restrict operators' actions.