Returns the topic name of a DDE link. Read-only.
link object.Topic as String
Each DDE link has a unique application name and topic.
The DDE topic broadly defines the type of data to be exchanged. For file-based applications, the topic is usually a filename. For other applications, the topic is an application-specific name.
The source (application) name and topic that define a link cannot be changed during the course of the conversation.
Microsoft DDE reference guide | source property
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