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A file designed as input primary (or indeed secondary) is read using the RPG cycle, that is you do not and indeed cannot issue your own reads or chains to that file. A file designed as fully procedural means that you control the reading of that file. In the very early days of RPG the cycle was the only way to process a file, and this function still remains in "modern" RPG, however it is rarely used these days, in fact most RPG programmers will have NEVER used it at all, though some people on this list still use it on occasion, as it is in theory quicker to read a file in using the cycle than to code it yourself.
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