  Event-by-event (ebe) fluctuations in mean pseudorapidity values of
relativistic charged particles in full phase space is studied by analysing
experimental data on $^{16}O-AgBr$ collisions at 14.5A, 60A, and 200A GeV/c and
$^{32}S-AgBr$ collisions at 200A GeV/c. The findings are compared with the
prediction of A Multi-Phase Transport(\amm) model and those obtained from the
analysis of correlation free Monte-Carlo events. Fluctuations in mean
pseudorapidity distributions are noticed to be in excess to that expected from
the statistically independent particle emission. The observed dependence of the
fluctuation strength measure parameter,$\phi$ on the beam energy and number of
participating target nucleons indicate that nucleus-nucleus collisions can not
be treated as simple superposition of multiple nucleon-nucleon interactions.
Presence of clusters or jet-like phenomena in multihadron final states are
searched for on ebe basis by using the concept of Jaynes Shannon entropy. The
findings indicate the presence of cluster like objects in the experimental data
with their size and frequency increasing with increasing beam energy. These
observations, in turn suggest that the clustering or jet-like algorithm adopted
in the present study may be used as a tool for triggering different classes of
events.
