Mostly Harmless
Legacy:UV2Texture
Display->UV2Texture
This property, in conjunction with Display->UV2Mode, allows a material to be superimposed on a static mesh, overriding (or overlaying on) the default material of the static mesh.
The main use for this property appears to be to add a custom lightmap on a static mesh. Such a lightmap must be mapped to the object underlying the static mesh using the second UV channel (in 3D Max terminology, I believe) or the UV map named 'UV2' (in Lightwave; it is essential that this exact name be used for the UV map). For an example of this, see the static mesh (in MyLevel) corresponding to the central chamber in DM-Antalus.
Discussion
Fat Marrow:This would ideally also explain about UV2Mode, if I knew how that worked, and refer to other (non-Lightwave) UV topics.