"A world’s first, the SH-AWD system combines front-rear torque distribution control with independently regulated torque distribution to the left and right rear wheels to freely distribute the optimum amount of torque to all four wheels in accordance with driving conditions."The following link has to be the best explanation of Super Handling All Wheel Drive (SH-AWD) found in the 2005 RL, 2007 RDX, and 2007 MDX.
Click the link below to watch the video directly from Honda.
[Video link] http://world.honda.com/HDTV/news/2004-4040401a/
It was first introduced in the 2005 RL and was named "Best of What's New in the Automotive Technology category of Popular Science Magazine's 2004 Best of What's New list."
"The Acura SH-AWD system is the first and only all-wheel-drive platform to distribute the optimum amount of torque not only between the front and rear wheels but also between the left and right rear wheels. The result is uncanny cornering performance that provides extremely neutral steering and outstanding vehicle stability."http://www.theautochannel.com/news/2004/11/10/277071.html