QAK
Query Acknowledgement
The QAK segment contains information sent with responses to a query. Although the QAK segment is required in the responses to the enhanced queries (see section 2.19), it may appear as an optional segment placed after the (optional) ERR segment in any query response (message) to any original mode query.
Figure 2-29. QAK attributes
RRequiredOOptionalCConditionalWWithdrawn|#Date/Time*Backward compat.+Filler
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