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Why do you use a control card?
A control card can be a member of a PDS or a sequential dataset and it used for storing the date field, Definitions of VSAM files ... etc. You use control card because you cannot use a instream procedure in a procedure. Generally you will be calling a PROC from your JCL and you cannot code instream procedure in the PROC and so you will point to the dataset which is called control card.
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