From ftm
The FTM & Co releases come with help patches and basic tutorials. In addition, there are these:
Contents
FTM Bascis & Conventions
Gabor
MnM
FTM SDK
This doc is still under development. For now you have to get the FTM sources via CVS at the FTM SourceForge project that also include a Doxygen API documentation.
The FTM header files are also included in the FTMlib framework that is part of the standard FTM distributions.