In this paper we prove that the initial-boundary value problem for the forced
non-linear Schroedinger equation with a potential on the half-line is locally
and (under stronger conditions) globally well posed, i.e. that there is a
unique solution that depends continuously on the force at the boundary and on
the initial data. We allow for a large class of unbounded potentials. Actually,
for local solutions we have no restriction on the grow at infinity of the
positive part of the potential, and for global solutions very mild assumptions
that allow, for example, for exponential grow.