http://www.nikonchat.com/nikon-camera-eyepiece/

Nikon D40 HELP?
For Nikon D40 camera, is made that you look at the screen when changing the picture, or you have to look through the eyepiece?
Christ on a bike ….. You look through the eyepiece!. Only a few have live-view DSLR, my Canon 40D and I am very rarely used (only for some shots macro). The Nikon D40 does not have Live-View, so no .. You will not be able to use it as a P & S camera. In addition, holding the camera to the eye and using the display has many advantages. One of the most important is that the camera is more stabilized. Try holding a DSLR with arms extended with a lens 200 mm f/2.8 attached and see how steady your arms ..
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