"Undocumented Windows: A Programmers Guide to Reserved Microsoft Windows Api Functions (The Andrew Schulman Programming Series/Book and Disk"
https://www.amazon.com/-/de/dp/0201608340
Pity as SOM was much better alternative than COM, and OS/2 in general.
However that wasn't the only issue that nailed OS/2's destiny, higher hardware resources and lack of proper management direction from IBM side also played a big role.