/*D
   MPI_Improbe - Nonblocking matched probe.

Synopsis:
.vb
int MPI_Improbe(int source, int tag, MPI_Comm comm, int *flag,
                MPI_Message *message, MPI_Status *status)
.ve

Input Parameters:
+ source - rank of source or MPI_ANY_SOURCE (integer)
. tag - message tag or MPI_ANY_TAG (integer)
- comm - communicator (handle)

Output Parameters:
+ flag - flag (logical)
. message - returned message (handle)
- status - status object (Status)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_COMM
.N MPI_ERR_RANK
.N MPI_ERR_TAG
.N MPI_ERR_OTHER

D*/

