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A Human Machine Interface (HMI) is the interface through which an operator interacts with a system and with the outside environment that the system monitors and controls. In LabVIEW, you use VIs as the HMI for an application. The LabVIEW Datalogging and Supervisory Control (DSC) Module installs controls and indicators and VIs and functions to help you create HMIs. Use the DSC Module VIs and functions to control the HMI, access the Citadel historical database, perform calculations and logic, and change between different displays.