DB2 UDB does not provide any components in it's trigger to determine this. Some iSeries programmers have used the Send & Receive Message APIs (QMHSNDPM & QMHRCVPM) where the program uses API QMHSNDPM to send a message to the message queue of the changing program's call-stack entry. API QMHRCVPM then retrieves the message from the message queue, obtaining the name of the program associated with that entry in the process.
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This was first published in June 2003