2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45880We review some of the reactions which can be studied in the $e^-e^-$ mode of a linear collider and may reveal aspects of physics beyond the realm of the standard model. The complementarity to $e^+e^-$ scattering is stressed.10 pages, uuencoded postscript, talk presented at the LCWS95 Workshop on Physics and Experiments with Linear Colliders held at Morioka, Sep 8-13, 1995High Energy Physics - Phenomenologytext