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  CONST
      { file access modes }
      FMClosed = $D7B0;    FMInput = $D7B1;
      FMOutput = $D7B2;    FMInOut = $D7B3;
 
  Unit:  Dos
 
  Description
 
    The constants for file-access modes are used for testing the Mode
    field in the TextRec and FileRec types (defined in the Dos unit)
    after file I/O. Use a variable of either type and the AND operator
    to compare the field with one of these constants:
 
       IF TextRec_variable.Mode = FMInput THEN . . .