Reference:RAWA/Selenitic Book display in Myst
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Q: A linking book can only link when the book is pressed and made with the right materials, using the right type of ink, and using the right words to create the link. If this is all true... Then how does the Selenetic book work. It's just an image on a screen? How does that link work? You never touch the book, much less... does a book even exist?
A: The D'ni stories of Atrus mention that the Linking Book to Selenitic was powered by machinery, but does not describe that machinery in any detail. We used the ship's screen to represent that.