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Ah ! the famous dotted lines !
How much question about this ? 10 ?
Ok, the lines show the viewport.
What's the viewport ?
When you set a zoom on paper, you can't view all the page. The dotted lines show the limit of the usable area of page : the viewport. When you press on next button (>) or previous (<), you change of area/"page".
It's useful in multicolumn document. When you change of "page", you could see what you have allready read.
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