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New heavy neutral gauge bosons Z' are predicted by many models of physicsbeyond the Standard Model. It is quite possible that Z's are heavy enough tolie beyond the discovery reach of the CERN Large Hadron Collider LHC, in whichcase only indirect signatures of Z' exchanges may emerge at future colliders,through deviations of the measured cross sections from the Standard Modelpredictions. We discuss in this context the foreseeable sensitivity to Z's ofW^\pm-pair production cross sections at the e^+e^- International LinearCollider (ILC), especially as regards the potential of distinguishingobservable effects of the Z' from analogous ones due to competitor models withanomalous trilinear gauge couplings (AGC) that can lead to the same or similarnew physics experimental signatures at the ILC. The sensitivity of the ILC forprobing the Z-Z' mixing and its capability to distinguish these two new physicsscenarios is substantially enhanced when the polarization of the initial beamsand the produced W^\pm bosons are considered. A model independent analysis ofthe Z' effects in the process e^+e^- \to W^+W^- allows to differentiate thefull class of vector Z' models from those with anomalous trilinear gaugecouplings, with one notable exception: the sequential SM (SSM)-like models canin this process not be distinguished from anomalous gauge couplings. Results ofmodel dependent analysis of a specific Z' are expressed in terms of discoveryand identification reaches on the Z-Z' mixing angle and the Z' mass.

Discriminating Z' from anomalous trilinear gauge coupling signatures in e+e- \to W+W- at ILC with polarized beams