Determines on behalf of a third-party user whether a named user
    can access the object specified.

    Format

      SYS$CHECK_ACCESS  [objtyp], [objnam], [usrnam], itmlst,

                        [contxt], [clsnam], [objpro], [usrpro]

    C Prototype

      int sys$check_access  (unsigned int *objtyp, void *objnam,

                            void *usrnam, void *itmlst, unsigned int

                            *contxt, void *clsnam, void *objpro, void

                            *usrpro);