A while ago, Wheeler and Feynman published a cornerstone paper Interaction with the Absorber as the Mechanism of Radiation Rev. Mod. Phys. 17, 157 - 181 (1945) Briefly, there are two EM waves associated with accelerated charged particle, advanced and retarded waves. According common interpretation, the advanced wave has no physical meaning because of causality principle. Does anybody have an opinion different from above said about advanced wave?