Abstract This paper has the purpose of introducing and bounding this workshop about Multifrequency Behaviour of High Energy Cosmic Sources. With the sole object of reaching such a goal we will point out several current problems and in order to stress the importance of multifrequency observations on the development of our knowledge of the Physics of the Universe we will discuss several examples taken from our direct experience and knowledge.
Keywords multifrequency astrophysics: high energy astrophysics T Tauri stars X-ray binary systems jets GRBs cosmic background astroparticle
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