[en] We study the gaugino+s-electron, Wν and Ze photoproductions off electrons with both beams polarized. We make a systematic calculation of the spin and angular asymmetries and obtain model independent results, which allow to identify the spin and/or charge of the scalar s-leptons and of the electroweak gauge bosons, either in the high energy limit or at the threshold. For example, the photon helicity asymmetries of the W and Z total cross sections have the distinct value 1 at threshold, but it is negative for the reactions γe → spinor + scalar. In the high energy limit, the same asymmetry for the differential cross sections is equal to one for spin zero boson and negative for W and Z photoproductions and Compton scattering. (orig.)