  Heavy flavour tagging provides a broad range of possibilities in testing QCD
features at LEP. We present here a study of 4jets events at LEP I where the
so-called light gluinos could be directly produced. We show that microvertex
techniques offer a unique chance to exploit simple kinematical distributions in
order to optimise the signal coming from gluino production with respect to the
background of ordinary QCD events. Our results indicate that experimental
analyses along the lines suggested here can exclude or reveal the presence of a
gluino for masses up to 10 GeV and lifetimes below 10$^{-9}$ sec. We also point
out that a large fraction of gluino events could decay in configurations
carrying large missing energy, so to escape the usual selection criteria of
4jet samples. In our study, mass effects of quarks and gluinos have been taken
into account exactly. Our results are independent from both the jet algorithm
and its resolution parameter.}
