Bidirectional integration with another application

Hi All,

I have requirement to write integration between Dynamics CE and another application. First things comes to my mind is to write two logics apps, each one listens to events source system and then gets triggers and update relevant system.

Is this a good design in terms of performance ? What happens if one of the system gets down for few minutes (although this will not happen). In this case what best design practice i can follow?

Please guide.

Thank you