Multiple Views in Windowed Mode (Direct3D 9)
In addition to the swap chain that is owned and manipulated through the Direct3DDevice object, an application can use the IDirect3DDevice9::CreateAdditionalSwapChain method to create additional swap chains to present multiple views from the same device.
Typically, the application creates one swap chain per view, and it associates each swap chain with a particular view. The application renders images in the back buffers of each swap chain, and then uses the IDirect3DDevice9::Present method to present them individually. Note that only one swap chain at a time can be full-screen on each adapter.
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