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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Include:  <io.h>
 
  Syntax:   int isatty( int handle );
 
  Returns:  a nonzero value if <handle> is a character device, or 0 if
            it is not.
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