  The specific heat capacity $c_v$ of glass formers undergoes a hysteresis when
subjected to a cooling-heating cycle, with a larger $c_v$ and a more pronounced
hysteresis for fragile glasses than for strong ones. Here, we show that these
experimental features, including the unusually large magnitude of $c_v$ of
fragile glasses, are well reproduced by kinetic Monte Carlo and equilibrium
study of a distinguishable particle lattice model (DPLM) incorporating a
two-state picture of particle interactions. The large $c_v$ in fragile glasses
is caused by a dramatic transfer of probabilistic weight from high-energy
particle interactions to low-energy ones as temperature decreases.
