  Accurate knowledge of the response of the detection system is very crucial
for unambiguous interpretation of the experimental data. A simulation code has
been developed using the Monte Carlo technique involving 3-body kinematics for
the analysis of data obtained with segmented large area Si $\Delta E-E$
detector telescopes in nuclear reaction measurements. Care was taken in the
analysis to maximize the angular coverage and statistics. The emphasis is
placed to extract the absolute cross sections of the different reaction
processes, for which coincident measurements are unavoidable. The estimated
detection efficiency of different coincidence events are found to depend on
various parameters, e.g., the relative energy of the breakup fragments,
incident beam energy of the projectile, ground state $Q$-value of the reaction,
the excitation of the ejectile as well as target like nuclei, mass asymmetry of
the breakup fragments, detection threshold, and geometric solid angle of the
detection setup. The interpretation of the various observables from the
exclusive measurements of breakup and transfer breakup reactions is reported.
