If you have 3 differently exposed images and they all look the same, you probably changed both exposure and shutter speed for each and the camera receieved the same amount of light OR, the RAW processor is making adjustments to show you the same result.
For HDR, you need to have a constant aperture and different shutter speeds (you can experient other things too). Put your camera on Aperture Priority (A) and shoot a few bracketed images. If the scene is really contrasty, you may need 9 exposures since the max EV on D200 is 1EV. So 9 exposures would be -4 -3 -2 -1 0 1 2 3 4.
You can also use a single RAW and process them at -2, 0, +2 (not really HDR)
If there are moving subjects in the shot, best way to handle the shot would be to use one of the exposures from the bracketed shots on a different layer, and use masking to insert the subject in place so it doesn't appear at different places or blurred. There would be at least one exposure where the moving subject looks OK for the scene.
Once you have that many exposures, you can mix them to create what you wanted.
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