dpi is dots per inch. 300dpi is about standard for printers. There's tricks to send this higher.
Unless things have changed, resolution on most monitors is 72 ppi (pixels per inch),  I wouldn't be surprised if this is no longer true, though.

I remember seeing a tutorial somewhere about pixel settings vs image sizes. Or maybe it was just a thread. You might drop a line in the Printers forum, they do a lot more of the high-end printing and know this stuff better than I do.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)