The DDE DLL maintains information about all active conversations which is available to the ESL program through the following functions:
Only the application name, topic name, and most recent error ID are stored with the conversation for the entire life of the conversation.
Other information, such as the current item name, format, or status flags, should only be queried while executing a response to a DDE event for which that information is relevant. DDE Commands describe which information is available during each event.
