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Using the Unit Control Block (UCB) z/OS DFSMS Installation Exits SC23-6850-01 |
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For BDAM and concatenated partitioned data sets, the UCB whose address is supplied to the exit might not be the only UCB that is associated with the DCB that is being opened. Do not modify the UCB. Data sets such as dummy, spooled, TSO terminal, and z/OS UNIX file have a zero UCB address. |
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