After a menu has been loaded or created, it must be assigned to a window before Windows can display it. You can assign a menu by defining a class menu. For more information about class menus, see Window Class Menus. You can also assign a menu to a window by specifying the handle of the menu as the hMenu parameter of the CreateWindow or CreateWindowEx function, or by calling the SetMenu function.
To display a shortcut menu use the TrackPopupMenuEx function. Shortcut menus, also called floating pop-up menus or context menus, are typically displayed when the WM_CONTEXTMENU message is processed.
The older TrackPopupMenu function is still supported, but new applications should use the TrackPopupMenuEx function.