You could also use QR Code generators and print 15 QR Codes, then use Barcode Scanner on each device and just scan the barcodes. Here's a LifeHacker article on the subject:
You could also use QR Code generators and print 15 QR Codes, then use Barcode Scanner on each device and just scan the barcodes. Here's a LifeHacker article on the subject:
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