JimmyJohn,

when you want a single kind of texture on multiple objects, to make them look like one (walls from segments is the typical example) then you should not map them with local, object-relative coordinates like UV at all. You should apply global (or world) coordinates instead. For this purpose, many material nodes (accessible through Advanced interface) offer a Global Coordinates box that in this case should be checked. Images, 3D texture generators, etc work that way exactly for the purposes you stated.

Note however that when an object is global-coordinate mapped, that texture will change when you move that object in the scene. So, in still renders it does not matter but in animations one can get weird effects.

have fun. 

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though