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So, in the books we see the spell accio being used a few times to bring forth a desired object to the caster. However, we also see that to get the desired effect, one doesn't have to be too accurate in their description of the object (Harry says accio firebolt and his broom alone comes to him), and yet sometimes they get a range of objects that fit the description (Hermione calls for books about Horcruxes, and many of them come to her).
So I think that begs two questions.
- What is the range of Accio? Could I call for something that was on the other side of the country? What about the other side of Hogwarts?
- How accurate is it? If I said "Accio Notebook" would it bring me my own notebook, or all the notebooks in the room?