[OMPI users] Open-MPI and TCP port range

[Laurent . POREZ]

Hi, 

I am  a new user of Open-MPI, and I need to use 2 kinds of programs on an 
unique cluster :
1) MPI based programs
2) Others, using TCP and UDP

In order to get my non-MPI programs run, I need to know which ports may be used 
by MPI programs.
Is there a way to know/set the range of the ports used by MPI programs ?

Thanks
        Laurent.