Subdividing panels in Blender 2.56

Support Basics & Interface
1

Hi,
Just a simple question, what is the hot key for subdividing a window panel in Blender 2.56? It was a right click on the line that divided two panels in 2.49, but that doesn’t work anymore.

2

http://www.blender.org/development/release-logs/blender-256-beta/updated-gui/

http://blenderartists.org/forum/showthread.php?t=209287