  We address the generation of fully inseparable three-mode entangled states of
radiation by interlinked nonlinear interactions in $\chi^{(2)}$ media. We show
how three-mode entanglement can be used to realize symmetric and asymmetric
telecloning machines, which achieve optimal fidelity for coherent states. An
experimental implementation involving a single nonlinear crystal where the two
interactions take place simultaneously is suggested. Preliminary experimental
results showing the feasibility and the effectiveness of the interaction scheme
with seeded crystal are also presented.
