  We discuss various experimental tests of the left-right symmetric model
possible to perform in the next generation linear colliders. We consider
processes which provide sensitive probes of the basic ingredients of the model:
right-handed gauge bosons, right-handed Majorana neutrinos, lepton number
violating interactions and triplet Higgs scalars. A supersymmetric version of
the left-right model is also studied and some distinctive experimental tests
for it is proposed. One of the main messages of this talk is to emphasize the
usefulness of the collision modes $e^-e^-$, $e^-\gamma$ and $\gamma\gamma$ for
the tests of the left-right symmetric model.
