2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88922It is argued that: 1) Quantum Mechanics implies the preferred frame also because of the collapse delayed at detection, 2) forthcoming experiments with moving beam-splitters will allow us to decide between Preferred Frame and Multisimultaneity, and 3) if the Preferred Frame prevails, superluminal communication is in principle possible.10 pages Latex, 1 eps figure. The possible implications of the experiment proposed in Physics Letters A 269 (2000) 293 are discussed more in depthQuantum Physicstext