I've never quite gotten this straight. In a LOOKUP feedback loop to add or delete master records, the output record has to be buffered, since the primary input hast to be released before it can be read on whichever alternate input it's going to. For instance, to feed unmatched details back in as new masters, COPY will hold the one record waiting to be processed:
(end /) ... | a: lookup ... / ... | a: | copy | ... | a: But is there some idiom to ensure the next detail record won't jump ahead of this one? Or does LOOKUP try the alternate inputs first to make sure that can't happen? ¬R
