Multi-Wavelength Observations of Colliding Stellar Winds

Massive colliding wind binary stars serve as laboratories for the study of strong-shock physics. In these systems fundamental flow parameters (velocities, densities, directions) are often well known, and photon fields important for Compton scattering and ionization are usually defined or constrained as well. In this paper we review observed X-ray and radio characteristics of some important colliding wind systems. We discuss how X-ray and radio observations of these systems can be used to test models of the collision of massive flows in the presence of intense UV radiation and magnetic fields.