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If the codes are going to be given out then generate a complex one and produce a QR code - http://code.google.com/apis/chart/docs/gallery/qr_codes.html.
Then just implement a barcode reader (already done for Android / iPhone) for webcams ;-)
If the codes are going to be given out then generate a complex one and produce a QR code - http://code.google.com/apis/chart/docs/gallery/qr_codes.html.
Then just implement a barcode reader (already done for Android / iPhone) for webcams ;-)