Built-in variables accessibles in function graphs
Substance Batchtools User's Guide - Online BatchTools documentation (for what it worth...)
BatchTools command line help:
This documentation is normaly available only through command line, by taping <command> --help.
I gathered all this help information in the following document:
WerwackFx Channel - Presentation of some of the tools I developped
Vincent Gault's Substance Channel - Vincent Gault is providing a lot of really interesting tips and tutorials for Substance Designer, for beginners to advanced users