mouse_event
The mouse_event function synthesizes mouse motion and button clicks.
Windows NT/2000 or later: This function has been superseded. Use SendInput instead.
VOID mouse_event(
DWORD dwFlags, // motion and click options
DWORD dx, // horizontal position or change
DWORD dy, // vertical position or change
DWORD dwData, // wheel movement
ULONG_PTR dwExtraInfo // application-defined information
);