Hi Modelhead, hi folks.
Yes, my avatar shows me (from behind) fying three dual lines stunt kites at the same time. Thats six lines in all. This picture was taken in 2007 during a winter kite festival. I was flying on a frozen river in the province of Quebec. These kites are not extremely large at 2.2 meters (or 7 feet) in wingspan and, since they are super ultra light (for extremely low winds, less than 5 km/h or 3 mi/h), they are not pulling very much. However, I flew slighly larger (and sturdier) kites in Dieppe, France in 2006 in 40+ km/h winds and this was a real good workout.
If you wonder how I do that, the answer is easy : each hand controls one kite with the lines attached to the ends of a stick held in the hand. The lines of the third kite are attached to each side of my waist.
The answer is easy but doing that takes some practice. Its fun though and very relaxing. I forget all of my problems when I have to split my brain in three, or four, if I talk to someone while doing this.
Just ideas.