typedef enum _KTRANSACTION_OUTCOME
{
         KTxOutcomeUninitialized = 0,
         KTxOutcomeUndetermined = 1,
         KTxOutcomeCommitted = 2,
         KTxOutcomeAborted = 3,
         KTxOutcomeUnavailable = 4
} KTRANSACTION_OUTCOME;

Windows Vista Kernel Structures