Call SetAbort to indicate that any current transaction that includes the MTS data module should abort. If MTS or COM+ started a transaction automatically (because the data module requires one), that transaction aborts when the current method call exits. If the MTS data module was enlisted in a pre-existing transaction, the client transaction will eventually fail. Usually, SetAbort is called in the except block of a try..exceptstatement. 

In addition to aborting any current transaction, SetAbort indicates that the MTS data module can be deactivated when the current interface call exits. This means that state information is not preserved for the next time the client calls the data module's interface. To prevent transactions from committing successfully without losing state information, use the DisableCommit method instead.

SetComplete 

DisableCommit 

EnableCommit 

IsInTransaction