[OMPI users] How to join intercommunicators?

[Mateus Augusto]

Hello,
 
I have a process that creates other processes at different times (using 
MPI_Comm_spawn). After, the initial process (creator of other processes) must 
receive mesagens of created processes. However, there are one intercommunicator 
for each created process. 
The question is: how to unite all the intercommunicator in a single  
communicator and receive the mesagens from this single comunicator?
 
Thanks