SETWINDOWPOS

SWP_FRAMECHANGED  &H20

Applies new frame styles set using the SetWindowLongfunction. Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZEis sent only when the window's size is being changed

If you have changed certain window data using SetWindowLong, you must call SetWindowPos for the changes to take effect. Use the following combination for uFlags: SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED.

(GWL_USERDATA  (-21

Sets the user data associated with the window. This data is intended for use by the application that created the window. Its value is initially zero.

(SetWindowLong(hWnd,GWL_USERDATA,Value

(Value=GetWindowLong(hWnd, GWL_USERDATA