  Whereas it is well known that gas may be driven into the core of merging
disks, fueling a central AGN or a nuclear starburst, recent studies have shown
that a significant fraction of the stellar/gaseous components is expelled into
the intergalactic medium along tidal tails. The tidal debris might be dispersed
in the intergalactic/intracluster medium where it adds to the diffuse
background light such as that observed in the Coma cluster, might fall back
towards the merger, or regroup to form a new generation of galaxies, the
so-called tidal dwarf galaxies (TDGs). We illustrate in this paper these
various phenomena with a detailed multi-wavelength study of the interacting
system NGC 2992/3 (Arp 245).
