1. A method, implemented in a computer system, of associating an input/output device with a portable scanner, comprising: receiving, at a computer system and from a scanner, a device identifier scanned from the scanner while displayed on an electronic device; associating, in a database in the computer system, the electronic device with the scanner based at least in part on the device identifier of the electronic device; receiving, at the computer system and from the scanner, scanned data scanned by the scanner; selecting, by the computer system, based at least in part on the device identifier associated with the scanner, the electronic device to send the scanned data; and sending, by the computer system, the scanned data to the selected electronic device.