Forces a transaction state change for a transaction in which
    there is at least one RM participant that has set the DDTM$M_
    COORDINATOR flag.

    Format

      SYS$TRANS_EVENT  [efn] ,[flags] ,iosb ,[astadr] ,[astprm] ,tid

                       ,rm_id ,tx_event

    C Prototype

      int sys$trans_event  (unsigned int efn, unsigned int

                           flags, struct _iosb *iosb, void

                           (*astadr)(__unknown_params), int astprm,

                           unsigned int tid [4], unsigned int rm_id,

                           unsigned int tx_event);