typedef enum _KTRANSACTION_STATE
{
         KTransactionUninitialized = 0,
         KTransactionActive = 1,
         KTransactionPreparing = 2,
         KTransactionPrepared = 3,
         KTransactionInDoubt = 4,
         KTransactionCommitted = 5,
         KTransactionAborted = 6,
         KTransactionDelegated = 7,
         KTransactionPrePreparing = 8,
         KTransactionForgotten = 9,
         KTransactionRecovering = 10,
         KTransactionSavepointing = 11,
         KTransactionPrePrepared = 12
} KTRANSACTION_STATE;

Windows Vista Kernel Structures