Thanks nruddock! 

But what I'm asking does'nt have anything to do with wanting to switch rooms, nor create alternate GUI dots, or set a preferrance; I do'nt think?

Right now I'm working with 4 cameras at once(see attached picture,) because I'm developing a new outfit for V3, from Photoshop.  Currently the AUX_CAMERA 4 Port is Selected.    But Lets say I want to render the Main Camera port.  How do I just switch ports, without changing the selection of the Parameters Palette?