Various observational appearences of the effects of wind-wind collision for
binary stellar systems have been discovered recently in X-ray, UV, optical
, IR and radio ranges. Recent 3D gas-dynamic simulations of the wind-wind c
ollision regions in WR+O, O+O and symbiotic binary systems allow to underst
and the physics of wind-wind collision effects, provide interpretation of o
bservational data and constrain basic parameters of winds as well as those
of binary systems.