  We present the sensitivity limits on the coefficients of a dimension-6
effective operators that parametrizes the possible effects of new physics
beyond the Standard Model. Our results are based on the study of the processes
$e^+ e^- \to W^+ W^- \gamma$, $Z Z\gamma$, and $Z\gamma \gamma$ at NLC
energies. In our calculations, we include all the anomalous interactions
involving vector and Higgs bosons, and take into account the Standard Model
irreducible background. We analyse the impact of these new interactions on the
total cross section and on some kinematical distributions of the final state
particles.
