4 Windows with 1 530t?

So here's the deal.  Customer had a python881xp installed at a circuit city in virginia, and window controllers installed somewhere else.  Well he comes to my shop yesterday saying that ever since the alarm was put in (last weekend) his battery has been dying everyday.  So I pull the truck in and start poking around.  I found the strangest thing I've ever seen.  Like the topic says a single 530t under the dash and from the noise, at least 4 or 5 relays in the drivers door.  Traced the draw problem to the rigged window controller and sent him packing to the other shop.  But anyway for the last day or so I been wondering how in the hell did they manage to wire up 1 530t to control all 4 windows UP AND DOWN?!?!?!?