The MTexture program shows how to use multitexturing. The scene consists of a room with walls that have a base texture and a spotlight texture, each using a different set of texture coordinates.
Source: (SDK root)\Samples\Multimedia\D3dim\Src\MTexture
Executable: (SDK root)\Samples\Multimedia\D3dim\Bin
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This sample shows how to program the multitexture stages using the new IDirect3DDevice3::SetTextureStageState method. Dozens of different effects are attainable with this method. The sample just shows one, monochrome light mapping, which is very popular in current game titles.