topic

In the DDE or SuiteLink protocol, a topic is an application-specific subgroup of data elements. These protocols use a three-part naming convention to locate information in applications. In order for an application (such as InTouch HMI software) to retrieve data, it must know the name of the application, the topic, and the item. An example of a topic is the name of an Excel spreadsheet. See also Dynamic Data Exchange, SuiteLink.