Gauge Invariant YFS Exponentiation of (Un)stable $W^+W^-$ Production At   and Beyond LEP2 Energies
  We present the theoretical basis and sample Monte Carlo data for the YFS exponentiated calculation of $e^+e^- \rightarrow W^+ W^- \rightarrow f_1\bar f'_1 + \bar f_2 f'_2$ at and beyond LEP2 energies, where the left-handed parts of $f_i$ and $f'_i$ are the respective upper and lower components of an $SU_{2L}$ doublet, $i=1,2$. The problem of gauge invariance of the radiation from the unstable charged spin~1 $W^{\pm}$ is solved in an entirely physical manner. Our formulas are illustrated in a proto-typical YFS Monte Carlo event generator YFSWW2, wherein both Standard Model and anomalous triple gauge boson couplings are allowed. 
S. Jadach (Institute of Nuclear Physics, Krakow, Poland and CERN,   Theory Division, Geneva, Switzerland), W. Placzek (Depar...