求高人指定以下函数用法，最好能举例子，多谢

yours0

1.HWND FindWindow(LPCTSTR lpClassName, LPCTSTR lpWindowName)

   HWND FindWindowEx(HWND hwndParent, HWND hwndChildAfter,LPCTSTR lpClassName, LPCTSTR lpWindowName)

2.HWND WindowFromPoint(POINT& Point)

3.BOOL CALLBACK EnumChildProc(HWND hwnd,LPARAM lParam)

   BOOL CALLBACK EnumChildWindows(HWND hWndParent, WNDENUMPROC lpEnumFunc,LPARAM lParam)

   BOOL CALLBACK EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam)

   BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)