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_conio_kbhit
============

Syntax
------

     #include <conio.h>
     
     int _conio_kbhit(void);

Description
-----------

Determines whether or not a character is waiting at the keyboard.  If
there is an ungetch'd character, this function returns true.  Note that
if you include `conio.h', the kbhit: function is redefined to be   
this function instead.

Return Value
------------

Nonzero if a key is waiting, else zero.