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During past 15 years a set of brand new results in nonequilibrium processes have been emerged.Among them, the free energy equality (Jarzynskii equality) and the generalized Einstein relation are the noticeable example.They appear to be two sides of same physics: the existence of Boltzmann-Gibbs distribution (canonical ensemble) and the energy-like function.Nevertheless, stochastic differential equation realizations seem to lead to some ambiguities as exemplified by Ito vs Stratonovitch.