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   isatty
   Usage
   #include <io.h>
   int isatty(int fd);

   Description
   isatty  determines  if the handle fd is associated  with  a  terminal,
   printer, or a serial port.

   Example
   #include <stdio.h>
   #include <io.h>
   main()
   {
        if(isatty(fileno(stdin)))
             printf("stdin is connected to keyboard\n");
        else
             printf("stdin is connected to a file\n");
   }

   Return Value
   The  function  isatty  returns a non-zero value if  the  device  is  a
   terminal, console, etc. and a zero if not (like a disk file).