contrast to the $XABTRM macro, which initializes a XABTRM at assembly time. The $XABTRM_STORE macro must reside in a code program section. Format $XABTRM_STORE XAB=xabtrm-address, ITMLST=item-list-address, ITMLST_LEN=#item-list-length, NXT=next-xab-address