  We consider the virtual signals of a $Z'$ of very general type in the process
$e^+e^-\to W^+W^-$ at a future linear $e^+e^-$ collider of 2000 GeV c.m. energy
($LC2000$). We show that possible deviations from the SM predictions in this
channel are related to similar deviations in the purely leptonic one in a way
that is only characteristic of this $Z'$ model, and not in general of possible
competitor models with anomalous gauge couplings.
