The main purpose of this paper is to prove that Bott integrable Hamilt
onian flows and non-singular Morse-Smale flows are closely related. As
a consequence, we obtain a classification of the knots and links form
ed by periodic orbits of Bott integrable Hamiltonians on the 3-sphere
and on the solid torus. We also show that most of Fomenko's theory on
the topology of the energy levels of Bott integrable Hamiltonians can
be derived from Morgan's results on 3-manifolds that admit nonsingular
Morse-Smale hows.