Hello,
 
I saw the road-show of _Napoleon_ when it played at Boston's Wang Center.
There was a center screen which was used for the whole movie, and two more
screens, one on either side which were used for a special [and short] sequence.
The effect IS spectacular!  And hey, the live full orchestra wasn't so shabby,
either.
 
I hope that this helps.
 
Best,
 
Andrew Jones
BBN Libraries