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Using Copybooks

In a typical development effort, different COBOL programs access the same data tables. Copybooks allow host variable definitions for a table's columns to be inserted within your COBOL code, allowing data from those columns to be used in your program. If a modification is made to a table (such as a change of data type or column length), then it is only necessary to modify the copybook rather than the source code definition for that table in all the programs that use it.

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