I was delighted about this when a client wanted a barcode scanner integrated with a web app. I envisioned major difficulties but instead it only took 5 minutes to implement.
Yep! I have a webapp that's been handling physical print-based photography awards for 7 years now. It generates a PDF label with barcode that the entrant sticks on the back of their print, and then they're shipped to the judging location and the award staff scan 4000+ entries over a couple of days. The barcode scanning was the easiest part of the whole project.
