Comteker,
Having done substantial modifications to the Modelsupport2.dll in the past (circa TestStand v2), I have not run across any documentation on this module, other than the comments in the C source code itself. If they've generated any since then, I haven't run across it. I don't believe it's changed much since TestStand v2, other than to update the TestStand API calls to the more robust function set, and removing deprecated functions. The bad news is that NI doesn't document the source they provide all that well (no version history, or function descriptions w/ interface info), but the documentation of the API calls used in this DLL are fairly well documented.
If you're trying to figure out how it works, my suggestion is to generate a debuggable version of the DLL, and run simulations, tracing into the dll at the points you're trying to understand better.
Hope this helps.
-Jack
