Using CueCat off of the "add books" page

I bought the CueCat for use as a classroom teacher - it is so great for cataloging my many books and I think the kids will really like my library thing site. I had been thinking that in order for a student to sign out a book, they could learn to scan the barcodes themselves...but I am under the impression from exploring around that I can ONLY scan a barcode in the "add books" section in order for it to be recognized as a title. I tried scanning a barcode into the "search" bar and it couldn't produce a title for me. Is there any way to search for books already entered into my library using the scanner, or is it solely for use in adding books? Thanks!

If you de-claw the CueCat, you can search your library via ISBN (the barcode).