All controls, except menus. For a window menu, call GetMenu() to get its handle.
Windows handle for the object.
Get_Property() returns integer window handle of an object.
Set_Property() is not used.
The HANDLE property returns a non-null , non-zero number if the window or control exists, making it easy to check if a window or control has been closed (or destroyed).
GetMenu(), DTHANDLE property, Microsoft Windows SDK