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Due to electroweak (EW) symmetry breaking, the couplings between three and four EW bosons are related. While cubic boson interactions are already well constrained experimentally, quartic gauge boson couplings (QGC) are not. We have proposed a method to probe QGC (γγ → WW, ZZ) in exclusive processes with forward proton tagging devices. Since much higher sensitivities can be attained in contrast to using conventional methods, the physics potential of the forward detector is high.