  We consider the discrete and continuous vector non-linear Schrodinger (NLS)
model. We focus on the case where space-like local discontinuities are present,
and we are primarily interested in the time evolution on the defect point. This
in turn yields the time part of a typical Darboux-Backlund transformation.
Within this spirit we then explicitly work out the generic Backlund
transformation and the dressing associated to both discrete and continuous
spectrum, i.e. the Darboux transformation is expressed in the matrix and
integral representation respectively.
