_isatty - C Language and Libraries Help

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_isatty

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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <io.h>
 
  Syntax:    int _isatty( int handle );
 
  Returns:   a nonzero value if <handle> is a character device, or 0 if
             it is not.
 
  See also:  _fileno
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