Thanks Doug. The documentation of TT_LoadProject() says "The TT_LoadProject() function loads a Tracking Tools project. ".
I was expecting that "loading" implied using the information as well What information from the project file does it actually pay attention to? Is a call to TT_LoadProject() exactly the same as subsequent calls to TT_LoadCalibration() and TT_LoadTrackables()? Maybe the documentation can be improved here.