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NCL supports the concurrent processing of multiple files (including a mixture of delimited format, mapped format, and unmapped format files) in addition to the use of VSAM alternate indexes that allow records to be retrieved using keys based on different parts of the data. For example, a UDB used to maintain Help Desk problem information might contain a sequentially allocated problem number, in addition to the name of the resource to which the problem was related. Using alternate indexes, it is possible to retrieve records in both problem number order and resource name order.
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