[en] The screening of electroweak forces for the class of rare processes is studied. The screening proves to be a consequence of horizontal symmetry of these interactions with respect to quark-lepton generations. A model of gauge superweak horizontal interactions is considered. Probabilities to find processes relating to superweak forces are being analyzed in the framework of this model. Possible contributions of horizontal interactions into experimentally observed parameters of rare ND-processes are obtained. This allows one to regard the following three types of processes: ΔH=0, Ksub(L, S)sup(0) → μ^-e⁺(e^-μ⁺)..., ΔH=1, Ksub(L, S)sup(0) → e⁺e^-, μ⁺μ^-; μ → eγ, μ → 3e, ...; ΔH=2, K⁰ reversible anti K⁰, D⁰ reversible anti D⁰, μ^-e⁺ reversible μ⁺e^-, ... where H is a horizontal quantum number