How to do double-sided texturing?

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Ah, now that you mention it...

I tried it, and it works, with a single sided object loaded (b3d-file), but the lighting-situation stays the same (light affects the backside a lot less, actually doesn't react at all).
I removed the lightsource from the scene and now both sides are lit the same (probably by the ambientlight).

But I could use this "feature".
Then it automatically appears if the inner side is darker than the outer side (or reversed if I flip the normals of the mesh).

I also tried copymesh (or copyentity, don't know anymore), but then my program freezes and can only be shutdown by using the task manager and "kill" the program.

Could it be that my plane (= testobject) was a child of a sceneroot, and that I tried to copy that child?