[OMPI users] how to make a process start and then join a MPI group

[Mark Borgerding]

I am writing a code module that plugs into a larger application 
framework.  That framework loads my code module as a shared object.
So I do not control how the first process gets started, but I still want 
it to be able to start and participate in an MPI group.

Here's roughly what I want to happen ( I think):
framework app running (not under my control)
       -> framework loads mycode.so shared object into its process
              -> mycode.so starts mpi programs on several hosts (e.g. 
via system call to mpiexec )
              -> initial mycode.so process participates in the group he 
just started (e.g. he shows up in MPI_Comm_group, can use MPI_Send, 
MPI_Recv, etc. )

Can this be done? 

I am running under Centos 5.2

Thanks,
   Mark