Android :: Normal Maps Vs Normal Coordinates

I'm currently working with OpenGL ES 1.1 and using the DrawElements convention along with Vertex, Normal, Texture Coordinate, and Index arrays.

I recently came across this while researching the idea of using Normal/Bump mapping which I previously though impossible with OpenGL ES: http://iphone-3d-programming.labs.oreilly.com/ch08.html

I can generate an object-apace normal map already from my 3D modeler, but what I'm not completely clear on is whether or not the Normal coordinates array will be necessary any longer if implementing a 2nd texture unit for normal mapping, or will Lighting + Color Texture Combined with a Normal map via the DOT3_RGB option be all that is required?

EDIT - After researching DOT3 Lighting a bit further, I'm not sure if the answer given by ognian is correct. This page, [url] gives an example of it's usage and if you look at the "Rendering & Final Result" section bit of code, there is no normal array ClientState for Normal Arrays is never enabled.

I also found this post here,[url] which explains it well... but leads me to another question. In the comments, it's stated that instead of translation of normals, you translate light direction. I'm confused about this as if I have a game with a stationary wall... why would I move the light around just for one model? Hoping someone can give a good explanation of all of this...