Mike – have you seen folk using QRcodes to trigger actions other than visiting a web page Eg to force the phone to perform some action other than opening a browser and navigating to the encoded URL? (cf http://www.mobile-barcodes.com/qr-code-generator/ )

As QR codes gain traction for the browsing action, would a QR code that forced an action other than opening a webpage confuse/concern the user?

How could alternative actions be encoded? Symbols next to the QR code showing what it does? Using different colour encodings to show eg black QR code calls a webpage, red QRcode requests a callback etc?