Turtle uses a layer system to set up baking. Each bake operation you initiate operates on a specific bake layer, and each bake layer can hold different settings. This lets you separate different baking setups into different bake layers. See also Set up layers for baking with Turtle.
(the Texture Bake icon) in the Texture Baking shelf, or select Texture Baking > Bake from the main menu bar. During texture baking, the result displays in the Texture Baking View.