Thank you for answering...
When I ran yesterday the cxxpi.exe (from command line - mpiexec) I saw on my second computer 2 new processes. First one is cxxpi.exe and the second one is DeinoMPI.exe (the service - I think). That mean that mpiexec is opening on the remote computer the service, or the cxxpi.exe itself opens the service on the remote computer. Am I right?
What about the spawn function in MPI? Is it working the same way?