AFAIK, Blender doesn't have "tear off" windows, so you have to make the most of the one main window.

So, while you can't spread views over several desktops, you can split any of the Blender panels to create another "3D View" and set it to show the Camera view.
To do this righ click on the border between two panels and choose Split form the popup menu, drag to define where the split will happen, select "3D View" as the panel type (if you didn't split an existing "3D View") and then use either the View menu or NumPad0 to switch to Camera projection.