The ancient
Excel SDK
for creating C add-ins gives you access to the even more ancient
Excel4 Macro language.
The SDK functions Excel4 and Excel12 use function numbers defined in XLCALL.H to call any Excel function or macro.
In order to use those you need to know the arguments they take.
Microsoft Word documents from
Excel Forum
have been converted from .doc format to .docx format by opening the files in Word and saving them as .docx.
Run make to convert these to HTML documentation in the /docs directory.
Run make clean to remove all build artifacts.
The documentation is published to GitHub Pages