| Microsoft DirectX 8.1 (C++) | 
Removes the effect from the device. If the effect is playing, it is automatically stopped before it is unloaded.
HRESULT Unload(void);
If the method succeeds, the return value is DI_OK.
If the method fails, the return value can be one of the following error values:
| DIERR_INPUTLOST | 
| DIERR_INVALIDPARAM | 
| DIERR_NOTEXCLUSIVEACQUIRED | 
| DIERR_NOTINITIALIZED | 
  Windows NT/2000/XP: Requires Windows® 2000.
  Windows 98/Me: Requires Windows 98 or later. Available as a redistributable for Windows 98.
  Header: Declared in Dinput.h.