The code specifies that the edit control will display altered text. The control's parent window receives this code through a WM_COMMAND message from the control; notification occurs after the control has formatted the text, but before it displays the text. This makes it possible to alter the window size, if necessary.
| Parameter | Description |
| wParam | Specifies the control ID. | |
| lParam | Contains an edit-control window handle in its low-order word and the EN_UPDATE code in its high-order word. |