  We show that intensive thermodynamic parameters associated to additive
conserved quantities can be naturally defined from a statistical approach in
far-from-equilibrium steady-state systems, under few assumptions, and without
any detailed balance requirement. It may apply, e.g., to dissipative systems
like granular gases where volume or mass is still conserved, or to systems with
periodic boundary conditions where fluxes of conserved quantities are present.
We emphasize the usefulness of this concept to characterize the coexistence of
different nonequilibrium phases, and discuss the influence of the contact
between two different systems, in relation with measurement issues.
