UpdateWindow function user32
The UpdateWindow function updates the client area of the specified window by sending a WM_PAINT message to the window if the window's update region is not empty. The function sends a WM_PAINT message directly to the window procedure of the specified window, bypassing the application queue. If the update region is empty, no message is sent.
BOOL UpdateWindow(
HWND hWnd
);
Implementation
int UpdateWindow(int hWnd) => _UpdateWindow(hWnd);