22.1.2 Console I/O 
- 
  Return true if a keypress is waiting to be read.
- 
  Read a keypress and return the resulting character.  Nothing is
  echoed to the console.  This call will block if a keypress is not
  already available, but will not wait for Enter to be pressed.
  If the pressed key was a special function key, this will return
  '\000'or'\xe0'; the next call will return the
  keycode.  The Control-C keypress cannot be read with this
  function.
- 
  Similar to getch(), but the keypress will be echoed if it 
  represents a printable character.
- 
  Print the character char to the console without buffering.
- 
  Cause the character char to be ``pushed back'' into the
  console buffer; it will be the next character read by
  getch() or getche().
Release 2.4.3, documentation updated on 29 March 2006.
 
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