You can configure points that correspond to values in a physical device. The DDE Client communications enabler establishes a Hot Link to the DDE Server for all DDE points in your project configuration. For Hot Link Items, the Server provides an initial value, and then provides an update whenever the Item changes. However, the data is passed back to the Point Manager based on the update criteria you select for your DDE points.
When you define a point, the fields in the Point Properties dialog box have values that are unique to or have special meaning for DDE communications.
General point properties
Device point properties