Authorizes a new branch to be added to a transaction.

    Format

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

                      ,tm_name ,bid

    C Prototype

      int sys$add_branch  (unsigned int efn, unsigned int

                          flags, struct _iosb *iosb, void

                          (*astadr)(__unknown_params), int astprm,

                          unsigned int tid [4], void *tmname,

                          unsigned int bid [4]);