long mpiSequenceStatus(MPISequence       sequence,
                       MPISequenceStatus *status,
                       void              *external) 

SequenceStatus returns the status of a Sequence (sequence), and writes it into the structure pointed to by status, and also writes it into the implementation-specific structure pointed to by external (if external is not NULL).

The status information in external is in addition to the status information in status, i.e, the status information in status and in external is not the same information. Note that status or external can be NULL (but not both NULL).

external either points to a structure of type MEISequenceStatus{} or is NULL.