Version 4 buffers are those supported in OS/390® DFSMS Version 2 Release 10 program management (PM3). VERSION=4 must be specified on the IEWBUFF macro to obtain buffers in this format. Most buffers have not changed except for the version number, but VERSION=4 is supported by IEWBUFF for all buffers, whether or not there is a format change.

The name list has changed from version 2. Binder Name List buffer has has been extended to provide additional information about segments within a class. Segment ID and segment offset fields have been added. Boundary alignment, which was added late to the version 2/3 format as a temporary expedient, has been removed because segment offset provides better information.

This section contains the buffer layouts that have changed or have been added in Version 4. As indicated in Table 2, all the other buffer formats will be the same for Version 4 as in Version 3.