a) COMM-FUNCTION is a 4-byte field with 11 defined 88-level conditions: OPEN, CLOS, MODI, DEPT, WITH, XFER, INQR, HIST, INTR, STMT, REPT. - b) COMM-TARGET-ACCT is needed for transfer operations (TXN-TYPE-TRANSFER) where money moves from one account to another. COMM-ACCT-NUMBER is the source account.