This paper shows how the Prosit system, a new C + +-based framework for both sequential and distributed discrete event simulation, developed at INRIA-Sophia-Antipolis, makes an easy and efficient integration of classical discrete event simulation and of new high speed simulation techniques based on evolution equations possible. This demonstrates in particular the feasibility of distributed simulations involving simulators of different nature. Important applications of these techniques may be found in the simulation of communication switches, as illustrated in an example.