Hello, 

MPI_T_PVAR_HANDLE_ALLOC(session, pvar_index, obj_handle, handle, count)

...

OUT    count   number of elements used to represent this variable (integer)

It looks to me that pvar can have different classes, e.g., MPI_T_PVAR_CLASS_COUNTER, and datatypes, e.g., MPI_UNSIGNED.  And a pvar can be an array (of length count) of such datatypes.

I guess the common case is count=1.

Is my understanding correct?

Thanks

--Junchao Zhang