If you use exit 6 or exit 60 to extract information from the job's JCL and created installation-specific control blocks, you can implement Exit 44 to write those installation-specific control blocks to spool by:

1. Issuing a $GETBUF macro to obtain a buffer. The information contained in the installation-specific control block should be moved into the buffer.
2. Issuing a $CBIO macro to write the buffer to spool.
3. Updating a user field in the $JCT with the address of the spool installation-specific control block.
4. If you intend to update the JQE passed in your exit, $DOGJQE should be used to obtain an update mode JQE and to return it when the updates are complete. You do not need to write the $JCT to spool since JES2 will write the $JCT to spool after returning from Exit 44.