In this talk we will present some of the recent results from the exper
iments E863 and EMU12 using the BNL AGS Au-beam at 11.6 A GeV/c and th
e CERN SPS Pb-beam at 158 A GeV, respectively. Aspects on the particle
production and on the target break-up will be discussed. The results
are compared with model expectations. The lead data is here shown for
the first time.