  Photon-photon collisions are investigated in the framework of the
two-component Dual Parton Model. The model is shown to agree well to hadron
production data from hadron-hadron and photon-hadron collisions. The
multiparticle production in hadron-hadron, photon-hadron and photon-photon
collisions as predicted by the model is compared. Strong differences are only
found as function of the transverse momentum variable. The hadron production in
photon-photon collisions at present and future electron-positron colliders is
studied using photon spectra according to the equivalent photon approximation,
according to beamstrahlung and according to backscattered laser radiation.
