MPI without MPIRUN ;point to point using Multiple EndPoints

Hello,

I want to create a cluster dynamically, with say 5 nodes . I want to have members join with communicate and accept.

(something like - https://stackoverflow.com/questions/43858346/trying-to-start-another-pro...)

Sample code attached (its code from the stackflow page)

Now instead of creating one point to point communication, I want to use multiple threads each having its own communicator using end point.

But I am unable to understand ,how it can be done . 

Can someone please provide an example.

regards