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 isatty()                Check for Character Device

 #include   <io.h>

 int        isatty(handle);
 int        handle;                      Handle of the device being tested

    isatty() checks whether 'handle' is associated with a character
    device (i.e., a terminal, console, printer, or serial port).

    Returns:    Non-zero if 'handle' is associated with a character
                device; otherwise zero.

 Portability:   Applies to MS DOS only.

   -------------------------------- Example ---------------------------------

    The following statements determine if 'fhndl' is associated with a
    character device. If not, they get the file pointer position.

           #include <io.h>

           int fhndl;
           long position;

           main()
           {
                 fhndl = open("data",O_RDWR);
                 if (isatty(fhndl) == 0)
                    position = tell(fhndl);
           }