The Monte Carlo program KoralW version 1.42 is presented, It generates all
four-fermion final states with multibranch dedicated Monte Carlo presampler
s and complete, massive, Born matrix elements, The presamplers cover the en
tire phase space. Multiphoton bremsstrahlung is implemented in the ISR appr
oximation within the YFS formulation with the O(alpha(3)) leading-log matri
x element. The anomalous WWV couplings are implemented in CC03 approximatio
n. The standard decay libraries (JETSET, PHOTOS, TAUOLA) are interfaced. Th
e semi-analytical CC03-type code KorWan for differential and total cross se
ctions is included. (C) 1999 Elsevier Science B.V. All rights reserved.