  We present a complete 1-loop study of the process $\gamma \gamma \to
\tchi^0_i \tchi^0_j$ and the predicted cross section in a $\gamma\gamma$ Linear
Collider. A suitable numerical code PLATONlc, valid for any set of real MSSM
parameters, is released. This study and code are complementary to those
suitable for Dark Matter detection through the inverse process $\tchi^0_i
\tchi^0_j \to \gamma\gamma$ describing neutralino-neutralino annihilation at
rest, which were presented previously. If SUSY is realized in Nature, both
codes should be very helpful in future astrophysical and collider studies of
the neutralino sector.
