The construction of orbits with specific asymptotic properties, such as orbits
that are heteroclinic or homoclinic to certain invariant sets, involves
tracking stable and unstable manifolds around the system's phase space. This
work addresses how, in some generality, the tracking can be achieved during
the passage near a distinguished invariant manifold in the phase space. This
leads to a very general form of the Exchange Lemma and it is further shown how
the lemma can be used in the construction of distinguished homoclinic and
heteroclinic orbits.