TWAIN Specification describes the interface between an Application and a TWAIN driver. Each release consists of the following artifacts:
- TWAIN Specification document
- Errata document identifies problems that may be addressed in the next release
- Features document provides an overview of items that are new to the current TWAIN Specification
- TWAIN.H file is a C/C++ header file used by Application and TWAIN driver developers
The current version of the TWAIN specification is 2.4 - and you can find it here.