The Change Program Data (QBNCHGPD) API introduced with release 6.1 has also been made available for release 5.4 by means of a couple of PTFs. Although IBM released this information in a Software Knowledge Base Document published early this year, it did not come to my attention until mentioned by list owner and moderator David Gibbs in a thread on midrange.com recently. The thread took its origin in a requirement of being able to source debug a program module compiled with debug view (DBGVIEW) *SOURCE, where the source file location being pointed to in the module object had changed since the module creation.