When you are configuring dumps and traces for an MSS-enabled enterprise server, you might want to select dump on transaction abend; on the ESMAC Control page click Tran next to Dump on ABEND. Dumps created when transactions abend are internally triggered dumps. When you do your data capture, you should include the transaction abend dump, if one exists.
There is a fourth way of obtaining an externally triggered dump: issue an EXEC CICS DUMP command in a CICS program.