While the ADCD is officially an IBM licensed product for developers, "ADCD 1.13" became legendary in the "Mainframe Enthusiast" community.
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It is important to note that systems are proprietary software owned by IBM. Z Os Adcd 1.13 - 13
: Enhancements for spool volume management and faster freeing of tape volumes to shorten batch windows. While the ADCD is officially an IBM licensed