Switch between turntable and trackball rotation New to Blender.  Working exclusively in User Persp window on 3D viewport (which is how I always like to work in 3D Studio).

Looked everywhere, no info:  Where is the menu setting or key combo to lock the Z-axis so I can turntable my view orbits?
Go to User preferences, then change the tab to Input then toggle the orbit style to your liking.