An overview is given over recent measurement of how and particle produ
ction in the energy range from 0.1 to 2 AGeV. Excitation functions for
the directed sideward and the azimuthally symmetric transverse flow a
re presented and show the importance of how phenomena in this incident
energy regime. Rapidity density distributions are indicative of a sys
tem size dependence of the stopping process. The role of strange parti
cles as a probe for the hot and dense phase of hadronic matter is disc
ussed with respect to the production and propagation. The spectra of K
aons indicate an equilibration with the surrounding baryons during the
expansion while their directed how pattern is different from that of
the nucleons.