This decision addresses one of the more perplexing problems of book and records litigation - what exactly is the plaintiff entitled to review? The Court of Chancery expects plaintiffs to limit their demands to what is really necessary and to explain to the Court, sometimes with witnesses, exactly what should be inspected to meet the proper purpose established at trial. A blunderbuss approach is likely to irritate the Court and get you less than you really want. This decision spells out the sort of evidence that should be presented to inspect specific records.
It'd make a useful exam question if you're that sort of professor.Update: Francis Pileggi has more details.