[MPICH] Dynamic process

[Mesri]

Hi,
In MPI-2 standard, we can create new processes thanks to MPI_Comm_spawn 
routine but there isn't any routine that allows to delete created 
processes. However, we can terminate a process within call to 
MPI_Finalize. So to terminate an alone process, I think that is easy:
1- free the intercommunicator between parent process and child;
2- call MPI_Finalize().
My question is the following:
What is the treatement when I have N processes and I would delete, for 
example, just one process from the group?
Thanks in advance for your response
regrads