  The forward-backward (FB) multiplicity correlations in two windows separated
in rapidity and azimuth are analyzed in the framework of the model with
independent identical emitters (strings). Along with the short-range
contribution, originating from the correlation between particles produced by a
single string, the long-range contribution, originating from the fluctuation in
the number of strings, is taken into account. The connection of the FB
multiplicity correlation coefficient with the two-particle correlation function
and the di-hadron correlation analysis is traced. It's also shown that the
direct azimuthal flow leads to the forward ridge structure in the resulting
two-particle correlation function.
