multiple UV textures1 obj

Multiple uvtextures on one Object?

If this is possible, then please tell how. If multi-uv-texturing is impossible, then why does multi-texturing work without uv’s?
I’ve tried this several times, but it doesn’t seem to work.

What i have right now is an enormous scene, which took a long time to UV texture paint, now what i’d like to do is have another layer of texture over the first. (It must be separate from the first) However, when i try to unwrap it again onto a blank texture it just jumps back to the 1st texture.
please help,
A texture beginner

Check this tutorial out. It addresses the multiple UV thing well. I would suggest watching the whole tutorial, as it will address all sorts of texturing techniques.

http://www.blenderguru.com/how-to-create-realistic-outdoor-lighting/

Hope this helps.