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[[File:Screen-Smart Device Interaction.jpg|framed|center|SSI 1]]
<ref>[http://www.cayintech.com/digital_signage_solutions/QR_code_digital_signage.html Cayin - "Control digital signage"]</ref>
<ref>[http://passport.comqi.com/how-it-works.php Comqi - "Passport links mobile phones to an in-venue digital screen"]</ref>
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