[Koha-devel] Doubts about barcode readers

I've some doubts about this. "Grepping" the directory I've found a getbarcode sub defined in the Scan.pm module, but it's void. So... where's the code for using a barcode reader in koha? I've more doubts but I think it will be solved when I see the code... :-) This questions are done because one of my goals, appart from the Spanish translation, is to develop a module to give koha RFID readers support.