The real-time features discussed in this book apply within one Challenge/Onyx system, whether it stands alone or is a node in an Array system. You can distribute an application across multiple nodes of an Array using the Message-Passing Interface (MPI) standard. However, the MPI standard does not provide for guaranteed message latencies. As a result, you cannot distribute a real-time application across nodes of an Array. You can run multiple, real-time, applications in different nodes of an Array, but you cannot synchronize them at real-time levels of determinacy.