  We report on BeppoSAX broad band (0.1-100 keV) observations of bright Seyfert
2 galaxies and discuss the results in the framework of the unified theory of
AGNs. The data are used to probe Nh distribution in type 2 objects and to
identify heavily absorbed (10^24 <= Nh <= 10^25 cm^-2) sources, which are
particularly bright in hard X-rays. They also provide, for the first time, high
energy spectral data on Seyfert 2s and tight constraints on the shape of their
intrinsic power law continuum. These results confirm the basic expectations of
the unified theory and indicate where the INTEGRAL mission can give a
substantial contribution.
