  I describe how the signals corresponding to the supernova $\nu_e$ and
$\bar{\nu}_e$ (charged current reactions) as well as all active neutrinos
(neutral current reactions) can be separately observed in various existing
detectors. These observations would make it possible to determine the flux and
average energy (or temperature) for each of these three neutrino signal
components. I argue that all these quantities are needed in order to understand
the interplay between the so far poorly known supernova neutrino emission
process and the neutrino oscillations.
