Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mainframe computer terminology, VOLSER is an acronym for "Volume Serial Number," and refers to the number and barcode listed on data tapes.Mainframes (often colloquially referred to as Big Iron) are powerful computers used mainly by large organizations for critical applications, typically bulk data processing such as census, industry and consumer statistics, enterprise resource planning, and financial transaction processing.

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