  We develop an interpretation of the off-equilibrium dynamical solution of
mean-field glassy models in terms of quasi-equilibrium concepts. We show that
the relaxation of the "thermoremanent magnetization" follows a generalized
version of the Onsager regression postulate of induced fluctuations. We then
find the rationale for the equality between the fluctuation-dissipation ratio
and the rate of growth of the configurational entropy close to the asymptotic
state, found empirically in mean-field solutions.
