https://www.ibm.com/docs/en/ims/15.5.0?topic=set-dfssqxxx-member-ims-proclib-data
IMS 15.5 - System definition - DFSSQxxx member of the IMS PROCLIB data set
Use the DFSSQxxx member of the IMS PROCLIB data set to specify parameters related to the shared message queues and the CQS address space in DB/DC and DCCTL...