Request and Prequest

public class Request {

  // Nonblocking communication

  public Status Wait() throws MPIException {...}

  public Status Test() throws MPIException {...}

  public void Free() throws MPIException {...}

  public boolean Is_null() {...}

  public static Status Waitany(Request [] array_of_requests) 
                                            throws MPIException {...}

  public static Status Testany(Request [] array_of_requests)
                                            throws MPIException {...}

  public static Status [] Waitall(Request [] array_of_requests)
                                            throws MPIException {...}

  public static Status [] Testall(Request [] array_of_requests)
                                            throws MPIException {...}

  public static Status [] Waitsome(Request [] array_of_requests)
                                            throws MPIException {...}

  public static Status [] Testsome(Request [] array_of_requests)
                                            throws MPIException {...}


  // Probe and cancel

  public void Cancel() throws MPIException {...}

  ...
}

public class Prequest extends Request {

  // Persistent communication requests

  public void Start() throws MPIException {...}

  public static void Startall(Prequest [] array_of_requests)
                                            throws MPIException {...}

  ...
}