During Security Now! podcast (#510), Steve logged onto Leo's computer (452 miles away) by scanning the SQRL QR code being displayed on his screen using an early beta of an iOS SQRL client. This is a somewhat uncommon but, as you'll see, potentially handy and useful way of using one of SQRL's many operating modes.
Additional 2 minutes added to the end of Steve's original video, where he explains (after the Spinrite testimonial) in more detail.