Returns authorization information about a specified user.
    Format
      SYS$GETUAI  [nullarg] ,[contxt] ,usrnam ,itmlst ,[nullarg]
                  ,[nullarg] ,[nullarg]
    C Prototype
      int sys$getuai  (unsigned int efn, unsigned int *contxt, void
                      *usrnam, void *itmlst, struct _iosb *iosb, void
                      (*astadr)(__unknown_params), int astprm);
Additional Information:
explode
extract