| DefSubclassProc(IntPtr, WindowMessages, IntPtr, IntPtr) | Calls the next handler in a window's subclass chain. The last handler in the subclass chain calls the original window procedure for the window. |
| DefSubclassProc(IntPtr, UInt32, IntPtr, IntPtr) | Calls the next handler in a window's subclass chain. The last handler in the subclass chain calls the original window procedure for the window. |