  The programs WPHACT and WTO, which are designed for computing cross sections
and other relevant observables in the $e^+e^-$ annihilation into four fermions,
are used to make detailed and complete predictions for the semi-leptonic and
fully hadronic channels $e^+e^- \to \barq q l\nu, \barq q \barq q$. Both the
total cross sections in the LEP~2 energy range and some of the most relevant
distributions are analyzed. Particular algorithms are introduced for the fully
hadronic channels in order to analyze the $WW$ physics and to properly define
the signal versus the background. With appropriate kinematical cuts it has been
shown that the Neutral Current background can be made vanishingly small when
the problem of determining the $W$ boson mass is addressed. The remaining
background from the complete Charge Current and Mixed processes is again small
but not completely negligible. A detailed discussion is performed on the
validity of the most relevant approximations such as the double-resonant one.
The inclusion of final state QCD correction, in its {\it naive} form (NQCD), is
discussed and various implementations are examined.
