Multiphysics how to make communication between different physics (same model?)

Hi I need to make a coupling between three physics:

- MicrowaveHeating - Frequency Domain - Transient

- Non-Isothermal Laminar Flow

- Radiation Model

My problem is that I required to use the same time step in three physics but the different models have temperature, is this temperature shared by the physics automatic? Does any one know a tutorial, that shows how the communication is done between physics?

Thanks in advance.