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> But the compiler is different each time new features are added. The run time is different, too. That is to say, V5R2 may well have new OS APIs to handle things that V4R5 does not have. If the V5R2 binary running on V4R5 tries to call this OS API and can't find it... boom! It has been my understanding that the backward compatibility has always been intended so that the source will compile and run on a machine which is at the TGTRLS() parameter. So, if you say TGTRLS(V4R5M0), the source will actually compile on an original V4R5 machine. --buck
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