Available in 3ds Max 2011 and higher.
<adsk_Utility_VectorState>.the_vector_connected: boolean
<adsk_Utility_VectorState>.the_vector_shader: texturemap
<adsk_Utility_VectorState>.the_vector_paramName: string
<adsk_Utility_VectorState>.TheList: maxObject array
<adsk_Utility_VectorState>.Shader_Version: integer