  The influence of the multi-boson effects on pion multiplicities, single-pion
spectra and two-pion correlation functions is discussed in terms of an
analytically solvable model. It is argued that spectacular multi-boson effects
are likely to be observed only in the rare events containing sufficiently high
density fluctuations. The possibilities of unlike particle correlations for a
study of the space-time asymmetries in particle production, including the
sequence of particle emission, are demonstrated.
