Inverse Neutrinoless Double β-Decay at the NLC?

The NLC may allow us to search for the `inverse' process to neutrinoless double-$\beta$ decay, $e^-e^-\to W^-W^-$, which probes the existence of Majorana masses for neutrinos. Expectations for the observation of this process in both the Standard Model and its extension, the Left-Right Symmetric Model, are examined. (Talk given at the {\it {Workshop on Physics and Experiments at Linear $e^+e^-$ Colliders}}, Waikoloa, Hawaii.)