Last part of the weekly lecture series "Statistical dynamics of nonequilibrium systems". Another fundamental approach to create nonequilibrium steady states will be discussed, which is based on so-called thermostating mechanisms modeling the interaction of a subsystem with a thermal reservoir. For the example of a Gaussian thermostated Lorentz gas it will be illustrated how dynamical systems properties can be related to macroscopic transport following the thermostat approach. The characteristics of Nosé-Hoover thermostats will be briefly discussed. By defining a "non-ideal" Nosé-Hoover thermostat we will finally elaborate onto the universality of certain characteristics obtained from standard Gaussian and Nosé-Hoover thermostats.