  The Bethe-Salpeter Equation for a two-scalar, S-wave bound system,
interacting through a massive scalar, is investigated within the ladder
approximation. By assuming a Nakanishi integral representation of the
Bethe-Salpeter amplitude, one can deduce new integral equations that can be
solved and quantitatively studied, overcoming the analytic difficulties of the
Minkowski space.
  Finally, it is shown that the Light-front distributions of the valence state,
directly obtained from the Bethe-Salpeter amplitude, open an effective window
for studying the two-body dynamics.
