  We study NLO QCD corrections as relevant to hadronic W decay in W pair
production at a future 500 GeV electron-positron linac, with particular
emphasis on the determination of triple gauge boson vertices. We find that hard
gluon bremstrahlung may mimic signatures of anomalous triple gauge boson
vertices in certain distributions. The size of these effects can strongly
depend on the polarisation of the initial electron positron beams.
