The Back Ground Color ... buttons brings up a color editor. This color editor is also used to define the fog color in the fog panel.
The Width and Height fields display the size in pixels of the 3D window. These fields are not active type-ins. The 3D window will scale when the main window is rescaled.
Perspective and Orthogonal are radio buttons, i.e. selecting one de-selects the other. At the same time the three corresponding type-ins get activated or deactivated. In perspective the viewing frustum is defined by the Field of View (FOV) and a near and far clipping plane. For the orthogonal projection the viewing volume is a cube defined by its width, height and Depth.
The antiAliasing button is used to turn scene anti-aliasing on or off (it is equivalent to the Scene Anti-aliasing button in the main window). The pull-down menu located below this button allows to set the number of times the scene is accumulated. This number can vary from 2 to 66 (2 3 4 8 15 24 66).
The DOF button is used to turn the depth-of-field effect on or off (it is equivalent to the Depth Of Field button in the main window). The pull-down menu located below allows to set the number of times the scene is accumulated to achieve this effect. This number can vary from 2 to 66 (2 3 4 8 15 24 66). The distance along the Z axis, from the viewer to the focus plane can be specified using the Focus type-in. The amount of out-of-focus can be specified using the Constant type-in.