- 
 Goals:
     applications with varying number of tasks (task farm)
     coupling of applications (client/server)
     simple port of PVM applications
 
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 Problems: 
     static communicator model of MPI-1
     start of tasks strongly system dependent
 
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 Solution: 
     high-level routines to start tasks
     connection to new tasks via intercommunicator
     additional system dependent infos with MPI_Info
     MPI_UNIVERSE_SIZE: indication of number of available
     cpus
 
  
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 Basic mechanisms: