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  CONST
      InOutRes : Integer = 0;    { I/O result }
 
  Unit:     System (used automatically)
 
  Context:  IOResult
 
  Description
 
    InOutRes holds a value returned by the IOResult function. Several
    I/O procedures and functions pass information to IOResult through
    InOutRes.
 
    If I/O checking is turned off and IOResult is not called after an
    I/O operation, subsequent calls to certain I/O operations are
    ignored. The following routines require IOResult to be called if
    {$I-} is set and a previous I/O error has occurred:
 
      BlockRead   ║  FileSize  ║  SeekEof
      BlockWrite  ║  Flush     ║  SeekEoln
      Close       ║  Read      ║  Write
      Eof         ║  Readln    ║  Writeln
      Eoln        ║  Seek      ║