Passing By Reference If a parameter is specified By Reference, the subsequence can modify the data that was passed in. If the subsequence modifies the data, the data will be modified when it is returned to the calling sequence. If a parameter is not specified By Reference, when the subsequence is called, a copy of the data is made and the copy is passed to the subsequence. The subsequence can modify the copy of the data while the calling sequence will have the unmodified original data.
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