A dynamical mean-field can drive the electron distribution into a far-from-equilibrium state. The electron distribution governs the flow of currents and, thereby, it can influence the dynamics of a mean-field. In turn, a dynamical interplay emerges between mean-fields and electron distributions.
I discuss this interplay for open zero-dimensional systems. It is shown to be particularly interesting in itinerant spintronic systems. In these systems, a dynamical magnetization drives the electron system into a nonequilibrium state. The resulting nonequilibrium distribution affects the flow of charge- and spin-currents and, thereby, it can have a back-action onto the magnetization dynamics.