Editor scene preview window

Is there a way to take the renderings of two or more cameras and show them in a preview window in the editor? I ask because I have a background image that I render behind the scene with one camera and the other camera shows the scene objects. I wish to rotate and move objects so they line up properly with the background image. Right now I need to run the scene and then move the camera and objects around by changing their rotation and translation by typing in the numbers - I lose the easier controls I have in the editor. Anyone know if it's possible to get a preview window in the editor or know of any other solution to my problem?