OSError.E is an exception raised by a number of operating system
   interfaces such as File, FS, and Process.
   \index{errors, operating system}
   \index{operating system errors}
INTERFACEOSError ; IMPORT AtomList; TYPE Code = AtomList.T; EXCEPTION E(Code); END OSError.
E(code) is raised by a number of methods and procedures in the
   operating system interfaces to signal any of an open-ended class
   of failures.