When the CICS® VR
server address space activates, it attempts to allocate the CICS VR
message, trace and dump data sets using a predefined naming convention.
This value is also used as the high level qualifier, and optional second level qualifier by CICS VR when it is notified of DFSMSdss logical copies and when creating CICS VR change accumulation data sets. The first level qualifier and optional second level qualifier of this predefined naming convention is taken from the value specified in the CICSVR_DSNAME_PREFIX parameter.
See Understanding the DWWMSGA, DWWMSGB, DWWDMSG, and DWWDUMP data sets naming convention for more information.