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PST data sets can only be processed sequentially, using QSAM or BSAM, and update in place is not allowed. However, even though the IBM subsystem interface is used, BSAM NOTE and POINT macros are supported, so ISPF BROWSE and EDIT, ISPF option 3.3 and similar functions are supported.
Access methods such as BDAM and EXCP are not supported for PST data sets. By adding SORT and other common utilities which use EXCP to the EXCLUDE-SORT exclusion tables, you can tell CA Compress to force these programs to think a PST data set is a subsystem data set and to use BSAM. For this to work, however, the program must be able to handle subsystem data sets. Any program which works correctly with the SUBSYS JCL parameter should support PST data sets.
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