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Explanation: I haven't done much reference work for this query except for looking at my Winword in Office97. My question would be does this context not refer to printers since the "ppm" usually refers to "page per minute" performance of printers. If so, does this "NOSUPERSUB" not refer to no "superscript" nor "subscript" options to format text in word processors.
I hope this helps.
Neil (English prof).