Thanks Ed, but I do know that. What was it that triggered my "cover letter" question? A blog post by Willie Favero http://it.toolbox.com/blogs/db2zos/apar-friday-db2-support-for-zos-v1r90-sysplex-routing-services-ziip-awareness-enhancements-26180 where he talks about PK38867: DB2 Support For z/OS V1R9.0 Sysplex Routing Services zIIP Awareness Enhancements and where he says: "The APAR cover letter does a very nice job of explaining the impact of the z/OS 1.9 change on DB2 for z/OS. " And I vaguely recall from my IBM time years and years ago that there was a site in that time where PTF cover letters could be downloaded from. Maybe that is no longer true these times. And possibly that in the mean time text has been gradually shifted into the apar, because I have to admit that the explanations in this PKapar are quite well developed. take care & enjoy your long holiday weekend in the US. jan
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