OPEN/CLOSE/EOV (common) diagnostic aids

The following major diagnostic aids are provided for common Open/Close/End-of-Volume:

An explanation of how to use the transfer control table
An explanation of how to use error records for debugging
Description of system fields in various control blocks.

Note: This chapter discusses only selected control blocks. For more control blocks, with programming interface information, refer to z/OS DFSMS Macro Instructions for Data Sets.