MRO links and sessions

An MRO link and a set of parallel sessions are defined by:
DFHTCT TYPE=SYSTEM,SYSIDNT=ssss,ACCMETH=IRC∨(IRC,XM)
DFHCSDUP MIGRATE always produces a CONNECTION-SESSIONS pair of definitions:
DEFINE CONNECTION(ssss) ACCESSMETHOD(IRC∨XM)
DEFINE SESSIONS(sssssprp) CONNECTION(ssss) PROTOCOL(LU61)
       SENDPFX(sp)        SENDCOUNT(m)
       RECEIVEPFX(rp)     RECEIVECOUNT(n)
The SESSIONS name sssssprp is synthesized by concatenating the names of the SYSIDNT, SEND(sp) and RECEIVE(rp), for example:
SYSIDNT=BCIC,SEND=(SA,5),RECEIVE=(RA,3)
         =====>   SESSIONS(BCICSARA)