| SetClassLongPtr(HandleRef, ClassLongValues, IntPtr) | Replaces the specified value at the specified offset in the extra class memory or the WNDCLASSEX structure for the class to which the specified window belongs. |
| SetClassLongPtr(IntPtr, ClassLongValues, IntPtr) | Replaces the specified value at the specified offset in the extra class memory or the WNDCLASSEX structure for the class to which the specified window belongs. |
| SetClassLongPtr(SafeHandle, ClassLongValues, IntPtr) | Replaces the specified value at the specified offset in the extra class memory or the WNDCLASSEX structure for the class to which the specified window belongs. |