$XABFHC_STORE

   The $XABFHC_STORE macro moves user-specified values into fields
   of the specified XABFHC. The expanded $XABFHC_STORE code executes
   at run time on a previously initialized (allocated) XABFHC, in
   contrast to the $XABFHC macro, which initializes a XABFHC at
   assembly time. The $XABFHC_STORE macro must reside in a code
   program section.

   Format

     $XABFHC_STORE  XAB=xabfhc-address,

                    NXT=next-xab-address