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How does one send variables of user defined types across processors using MPI ?

For predefined ones, I use

call mpi_recv(A,1,mpi_real8,root_process,mpi_any_tag,mpi_comm_world,status,ierr)

But what should be done for user defined types
For example for,

integer,parameter::type=selected_int_kind (16)  
integer(kind=type)::i

Please give your suggestions/comments.

HP AS
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