z/OS Communications Server: IP Sockets Application Programming Interface Guide and Reference
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CALL instruction API compatibility considerations

z/OS Communications Server: IP Sockets Application Programming Interface Guide and Reference
SC27-3660-00

Unless noted in z/OS Communications Server: New Function Summary, an application program compiled and link edited on a release of z/OS® Communications Server IP can be used on higher level releases. That is, the API is upward compatible.

Application programs that are compiled and link edited on a release of z/OS Communications Server IP cannot be used on older releases. That is, the API is not downward compatible.

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