DDE API access is described in REDI DDE Usage document, and the latest version of that can be found within your REDIPlus installation in C:\Users\YOURUSER\AppData\Local\REDI Tech\AddIn folder.
The majority of the available acronyms are included in this document.
If you are looking for something that is not included but you believe is available from DDE, please post a question on REDI Q&A forum on this portal, and we will try to look into it .
Hope this helps
Where is that? Link? I'm having a hard time navigating