| Platform SDK: Windows Multimedia | 
The MCIWndEject macro sends a command to an MCI device to eject its media. You can use this macro or explicitly send the MCIWNDM_EJECT message.
LONG MCIWndEject( hwnd );
Returns zero if successful or an error otherwise.
  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Vfw.h.