Oooooh...check this out (from the review posted above)
[/drooling all over the keyboard]
Custom Display Host
The custom display host is pretty amazing. It let's you open any foreign application (such as a game engine) in a viewport. This means that a game developer can now run and test the game directly within XSI, no need to export everything anymore. You can easily play the game and test it, using a joystick or the keyboard . The custom view can also affect XSI's scene (ex: a user could select/modify a mountain in XSI, the mountain highlights would get highlighted/modified in the game viewer. Conversely, one could fly through the mountains on the game engine and see the camera in the XSI scene update accordingly. It is even possible to run another 2d or 3d application within the XSI viewport.
The custom display host is pretty amazing. It let's you open any foreign application (such as a game engine) in a viewport. This means that a game developer can now run and test the game directly within XSI, no need to export everything anymore. You can easily play the game and test it, using a joystick or the keyboard . The custom view can also affect XSI's scene (ex: a user could select/modify a mountain in XSI, the mountain highlights would get highlighted/modified in the game viewer. Conversely, one could fly through the mountains on the game engine and see the camera in the XSI scene update accordingly. It is even possible to run another 2d or 3d application within the XSI viewport.
[/drooling all over the keyboard]