RM/COBOL supports three distinct modes of transferring data to and from the terminal in an interactive fashion with the terminal operator:
Both the field-oriented and the screen-oriented modes of terminal control are nonstandard extensions to the COBOL language.
The three modes of communicating with the terminal are not intended to be intermixed within a given run unit. The interaction between the three modes is undefined, and intermixing elements from the three modes leads to results that are unpredictable and probably divergent across various implementations of RM/COBOL. A run unit should be planned with one of the modes in mind, and elements of the other modes should be avoided within that run unit.
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