Determining the callable service release level
New callable services may be added with each new z/OS UNIX release. Depending on the operating environment, the caller may have to determine the release level of z/OS UNIX before a new callable service can be issued.
The release information is indicated in the CVT feature flags.
For z/OS® V1R1, the feature
flag is:
CVTJ7713 EQU X'20' JBB7713