View Menu

Toolbars Toggles the toolbars.
Status Bar Toggles the status line.
Tool Properties Toggles the Tool Properties panel.

2D Vertices Ticks Display the vertices in the 2D windows.
3D Vertices Ticks Display the vertices in the 3D windows.
Show Bones Display the bones.

2D View...  
Draw BackFaces Toggle showing faces whose normals points away from the camera.
Shaded Give a depth cue by shading lines depending on their distance.
Play camera XY When playing an animation, also play in the TOP 2D Viewport.
Play Camera XZ When playing an animation, also play in the SIDE 2D Viewport.
Play Camera ZY When playing an animation, also play in the FRONT 2D Viewport.
3D View...  
Wireframe Show 3D View in Wireframe mode
Flat Shaded Show 3D View in Flat Shaded mode
Gouraud Shaded Show 3D View in Gouraud Shaded mode
Texture Mapped Show 3D View in Textured mode
Texture + Gouraud Show 3D View in Textured Gouraud Shaded mode
Draw BackFaces Toggle Showing Back faces in 3D view.
Bones Wireframe Draw bones in wireframe mode.
Bones Solid Draw bones in solid mode.
Bones Foreground Draw bones over the model skin.

Lock Views Any faces selected in the 3D view will also be selected in the Skin Editor.
Background Texture Select an image file to be displayed as background texture in the 3D window.