I think if possible, its available from DX8, which if I understand, can run DX7 framework?
http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dx81_c/directx_cpp/Graphics/ProgrammersGuide/AdvancedTopics/Antialias/FullSceneAntialiasing.asp
http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dx81_c/directx_cpp/Graphics/ProgrammersGuide/AdvancedTopics/Antialias/FullSceneAntialiasing.asp