2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173564One of the interaction regions at the linear colliders should be compatible both with e+e- and gamma-gamma, gamma-electron modes of operation. In this paper, the differences in requirements and possible design solutions are discussed.Talk at LCWS06, Bangalore, India, March 2006, to be published in Indian Journal of Physics; 3pp, Latex, 1 .eps figureInstrumentation and DetectorsAccelerator Physicstext