Panel Show to talk about Voice and Viewpoint

How do authors David McCaleb, Bruce Coffin and many others use voice and viewpoint in their writing. How does the reader know whether it is character or narrative voice. How do you express your viewpoint, that of the characters in your writing and how does this come across to your readers? What are the major elements needed to have your readers understand the viewpoints expressed in your novels? When creating viewpoints is it the main character we hear, do you write your chapters with different character headings letting readers know which character is speaking? What about Voice? How are these writing elements showcased in your writng?