“In 3dsMax 2009 we have the ability to simulate indirect illumination, which is the natural process of how objects reflect diffuse light energy in real life. This allows for more realistic and natural looking renders. There are many ways to imitate indirect illumination, however in this video we will focus on using the powerful Radiosity feature in 3dsMax 2009 to reproduce this natural light phenomenon.”
http://www.cgarena.com/freestuff/tutorials/max/i3d/radiosity.html