Cp Physics at Dafne

We briefly review K^0-meson physics, in particular the observation and phenomenology of CP violation which was discovered 27 years ago and, to date, is still only observed in Kl decays. During the intervening time much effort has been devoted to the search for direct CP violation, trying to detect whether Kl's decay to π^+π^- and π^0π^0 in different ratios. Since long ago e^+e^- colliders, pionieered at Frascati, have been considered as possible factories of clean physical states. We show the potential of DAPHNE to provide enough data to improve by an order of magnitude the sensitivity of such searches. We discuss the spatial accuracy required to measure the difference in phase of the amplitude ratios A(Kl->π^+π^-)/A(Ks->π^+π^-) and A(Kl->π^+π^-)/A(Ks->π^+π^-). We examine problems of regeneration and other physical backgrounds. Finally we discuss some requirements for electromagnetic calorimetry at DAPHNE and briefly describe a possible solution.