The DSQCOMM changed from Version 2 Release 4 to Version 3.2.
However, the Version 3.2 DSQCOMM provides message text that is especially useful if you have an error in your START command. If you want to use the new DSQCOMM, you need to recompile your program, and initialize DSQ_COMM_LEVEL (in DSQCOMM) to DSQ_CURRENT_COMM_LEVEL. If you do not set this value, QMF treats your DSQCOMM as a Version 2 Release 4 level.
The DSQCICX changed from Version 3 Release 1 Modification 1 to Version 3 Release 2. The interface between the QMF-supplied function call and the main QMF program has changed from a CALL interface to an EXEC CICS LINK interface. The new interface provides better isolation from the user program and the QMF product. Because the interface has changed, programs that used the callable interface must be link-edited again.