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How is the keyword DUMMY used in JCL?
For an output file DUMMY specifies that the output is to be discarded. For input it specifies that the file is empty.
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What is the difference between NEXT SENTENCE and CONTINUE?
NEXT SENTENCE gives control to the verb following the next period. CONTINUE gives control to the next verb after the explicit scope terminator. (This is not one of COBOL II's finer implementations). It's safest to use CONTINUE rather than NEXT SENTENCE in COBOL II.