  We present the Monte Carlo event generator KK version 4.13 for precision
predictions of the Electroweak Standard Model for the process $e^+e^-\to
f\bar{f} +n\gamma$, $f=\mu,\tau,d,u,s,c,b$ at centre of mass energies from
$\tau$ lepton threshold to 1TeV, that is for LEP, SLC, future Linear Colliders,
$b,c,\tau$-factories etc. Effects due to photon emission from initial beams and
outgoing fermions are calculated in QED up to second order, including all
interference effects, within Coherent Exclusive Exponentiation (CEEX), which is
based on Yennie-Frautschi-Suura exponentiation. Electroweak corrections are
included in first order, with higher order extensions, using the DIZET 6.x
library. Final state quarks hadronize according to the parton shower model
using JETSET. Beams can be polarized longitudinally and transversely. Decay of
the tau leptons is simulated using the TAUOLA library, taking into account spin
polarization effects as well. In particular the complete spin correlations
density matrix of the initial state beams and final state tau's is incorporated
in an exact manner. Effects due to beamstrahlung are simulated in a realistic
way. The main improvements with respect to KORALZ are: (a) inclusion of the
initial-final state QED interference, (b) inclusion of the exact matrix element
for two photons, and (c) inclusion of the transverse spin correlations in
$\tau$ decays (as in KORALB).
