title: back-tab with 2D QR barcode
body: <p>I need to put a "back-tab" into a bar code.  I'm assuming I cannot do this, since there is no ASCII equivalent character associated with it, unlike "tab" with is ascii character 0x09</p>
  
  <p>I have a form that I want to fill in by scanning a QR barcode.  There is a field on the form that when using the keyboard to fill in - you would select "shift-tab" on your keyboard to go back to the field, and then tab to move onto the next field.</p>
  
  <p>Any idea how I can accomplish this?</p>