Yes, a scan uses a tuner as it gets it's info from a sat channel as that's exactly what sky use. Possibly same (or similar one) that crossepg openTV uses.
The DW web address just displays the counter stuff.
The SW web address is the one once someone visits that page, it then registers as a visit (and then adds to the counter) so all I do is after a scan, I visit this page (behind the scenes).