All the transaction interfaces are COM (Component Object Model) interfaces and, therefore, the natural language of choice is C++. The interfaces are available in the following header files:
Transact.H
TxCoord.H
The first header file contains interfaces that an application will use to interact with the transaction coordinator (such as MS DTC); interfaces such as ITransactionDispenser, ITransaction, and so forth. The second header file contains interfaces which deal with the interaction between the resource manager and the transaction coordinator. Both of these header files are available with the MS DTC Software Development Kit (SDK).