fff89994_ation_Wheel___Beyond_the_Paper__Description
[Wedge] Walk [Usage Steps] When you click and hold the Walk wedge, the mouse pointer changes to the Walk Tool superimposed over a target. The target sphere represents the center of the view only. It does not create a new rotation target. You drag the mouse in any direction to move the camera. Drag upward to walk forward or downward to walk backward. You release the mouse button to exit the Walk Tool. You can change the speed at which you move through a model when using the Walk Tool. The Walk Tool must be active to change the movement speed. To Increase the speed, you press comma (,) to incrementally increase the speed of the Walk Tool. To decrease the speed, you press period (.) to incrementally decrease the speed of the Walk Tool. Any movement rate changes you make while using the Walk Tool will be in effect when you use the Look Tool. Senior Product Manager, Allister Lundberg notes that when the Walk Tool is active, you can temporarily access the Up/Down function of the Tour Building Wheel by pressing Shift to display an Up/Down slider. Drag the slider up or down to change the elevation of the camera. Thanks Allister. [Description] 
Move the camera within the model.
Autodesk Design Review 2008: Full Navigation Wheel - Beyond the Paper
Description