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It depends on how I'm doing the impedance matching. If I send or
receive all the detail at once, a data queue is nice. I have other
situations where I send/receive the detail one record at a time (first I
send the header, then each detail). In that case, I use two data DS's,
but the control DS tells me which one actually has data. It isn't
perfect, but it avoids an extra queue. Of course, the additional queue
could be either a feature or a bug depending on your design requirements.
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