It temporarily creates a high-resolution bitmap and prints it. It allows for the precise placement of elements on the page. I have never found this option necessary; on my printer the usual print-out is accurate enough.
If I were preparing a score for photoengraving, however, I would definitely be using this option (along with a high-quality printer).
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Le coeur a ses raisons, que la Raison ne connaît point. Paul Littlefield, retired Church musician
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