The default Rhino editor layout contains four viewports configured as the top, front and right side views, and a perspective view. As with all aspects of the interface you can customize the layout to your preference. Each viewport can also be stretched to fill all or any portion of the screen. Navigating in the Rhino viewports was a little confusing at first. Like most 3D modeling applications, object creation is done on construction planes.
Rhino is no exception.
However, being accustomed to UCS behaviour in AutoCAD, it took me by surprise to find that the UCS could be different in one viewport from another. AutoCAD 2000 finally has that functionality. Another interesting aspect of object creation in Rhino is the ability to complete commands in one viewport which were initiated in another. Not simply in the sense of specifying the other endpoint of a line, etc. The cursor is active in all viewports, simultaneously providing good 3D feedback while creating elements of the model.