  A kinetic Monte Carlo (KMC) method is used to study the structural properties
and dynamics of a supercooled binary Lennard-Jones liquid around the glass
transition temperature. This technique permits us to explore the potential
energy surface and barrier distributions without suffering the exponential
slowing down at low temperature that affects molecular dynamics simulations. In
agreement with previous studies we observe a distinct change in behaviour
around $T=0.45$, close to the dynamical transition temperature $T_c$ of mode
coupling theory (MCT). Below this temperature the number of different local
minima visited by the system for the same number of KMC steps decreases by more
than an order of magnitude. The mean number of atoms involved in each jump
between local minima and the average distance they move also decreases
significantly, and new features appear in the partial structure factor. Above
$T~0.45$ the probability distribution for the magnitude of the atomic
displacement per KMC step exhibits an exponential decay, which is only weakly
temperature dependent.
