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A description and the use of an event-generator code for two-photon processesat e+e- colliders, TREPS, are presented. This program uses an equivalent photonapproximation in which the virtuality of photons is taken into account. It isapplicable to various processes by specifying a combination of final-stateparticles and the angular distributions among them. A comparison of the resultswith those from other programs is also given.

TREPS: A Monte-Carlo Event Generator for Two-photon Processes at $e^+e^-$ Colliders using an Equivalent Photon Approximation