Rendering on multiple Windows ?

How do I use CreateDevice for creating a Device with which I can access the entire Desktop ? I want to use DirectX 9 to display bitmaps in many different windows and I cannot create a device for each window (too much memory). I want to only create 1 device for all of my windows. Unfortunately GetDesktopWindow() doesn''t work with CreateDevice. It does not give me an error message but it also doesn''t render in it. Is there a way to make this work ?